There is no global registry of open data portals. Socrata's /domains endpoint, ckan.org/about/instances, the dataportals.org API and opendatainception all return 404 or broken payloads, and data.gov and data.gov.uk block their CKAN APIs. This inventory is therefore constructed — harvested from Socrata's Discovery catalog and fingerprinted for CKAN — and has to be re-verified rather than looked up.

Level is a crude domain/title heuristic — it separates municipal portals from state and national ones well enough to count them, and will misclassify edge cases.

Municipal portals

Datasets Portal Platform Country Version
2,602 dati.comune.milano.it ckan IT 2.8.12
2,400 data.cityofnewyork.us socrata
1,421 data.edmonton.ca socrata
932 performance.seattle.gov socrata
915 data.cityofchicago.org socrata
707 datahub.austintexas.gov socrata
672 datos.madrid.es ckan ES 2.9.11
641 leedsdatamill.org ckan UK datapress
637 dados.fortaleza.ce.gov.br ckan BR 2.9.2
606 dados.pbh.gov.br ckan BR 2.10.5
482 dados.prefeitura.sp.gov.br ckan BR 2.7.7
454 data.buenosaires.gob.ar ckan AR 2.11.0
416 data.calgary.ca socrata
404 donnees.ville.montreal.qc.ca ckan CA 2.11.5
363 data.lacity.org socrata
342 www.dallasopendata.com socrata
313 data.oaklandca.gov socrata
303 citydata.mesaaz.gov socrata
282 www.opendata-hro.de ckan DE 2.12.0
281 data.cambridgema.gov socrata
249 dati.comune.matera.it ckan IT 2.6.2
239 data.brla.gov socrata
235 data.winnipeg.ca socrata
235 data.boston.gov ckan US 2.9.11
223 dados.recife.pe.gov.br ckan BR 2.11.5
223 dados.recife.pe.gov.br ckan BR 2.11.5
209 data.nola.gov socrata
202 data.kcmo.org socrata
199 data.zagreb.hr ckan HR 2.10.3
170 data.sanjoseca.gov ckan US 2.9.11
151 transparenz.karlsruhe.de ckan DE 2.11.3
147 cos-data.seattle.gov socrata
141 www.transparentrichmond.org socrata
134 data.sustainablesm.org socrata
121 data.providenceri.gov socrata
121 data.everettwa.gov socrata
103 data.norfolk.gov socrata
102 data.cincinnati-oh.gov socrata
89 data.cityofgainesville.org socrata
87 controllerdata.lacity.org socrata
73 performance.ci.janesville.wi.us socrata
68 gainesville-govstat.demo.socrata.com socrata
64 performance.cityofcamas.us socrata
60 data.roseville.ca.us socrata
44 data.cityofberkeley.info socrata
42 janesville.data.socrata.com socrata
35 performance.cityofrc.us socrata
33 data.somervillema.gov socrata
31 data.richmondgov.com socrata
27 data.cityoforlando.net socrata
21 covid19.buffalony.gov socrata
18 data.mesaaz.gov socrata
15 fiscalfocus.pittsburghpa.gov socrata
9 openperformance.edmonton.ca socrata
8 cityofcamas.demo.socrata.com socrata
6 cityoffairfaxpd.data.socrata.com socrata
4 opendata.cityofmesquite.com socrata
2 kirklandwa.data.socrata.com socrata

All responding portals

Datasets Portal Platform Level
188,847 data.qld.gov.au ckan city-or-region
68,183 data.gov.uk ckan national
36,959 data.gov.ua ckan national
36,680 open.alberta.ca ckan state
22,720 data.gov.ie ckan national
22,637 data.gov.gr ckan national
17,990 edx.netl.doe.gov ckan national
16,170 opendata.swiss ckan national
13,922 iatiregistry.org ckan other
12,439 dati.toscana.it ckan state
9,761 datos.codeandomexico.org ckan city-or-region
9,761 datamx.io ckan other
8,388 www.datos.gov.co socrata national
6,077 open.nrw ckan state
3,357 www.data.gov.bc.ca ckan state
3,213 datos.gob.cl ckan national
2,907 dati.emilia-romagna.it ckan state
2,717 catalogodatos.gub.uy ckan national
2,602 dati.comune.milano.it ckan city
2,427 opendata.aragon.es ckan state
2,400 data.cityofnewyork.us socrata city
2,006 journaldata.zbw.eu ckan other
1,974 data.bayareametro.gov socrata state
1,749 datos.gob.mx ckan national
1,530 opendata.maryland.gov socrata state
1,437 dati.trentino.it ckan state
1,421 data.edmonton.ca socrata city
1,377 datosabiertos.malaga.eu ckan city-or-region
1,296 data.london.gov.uk ckan national
1,081 data.cdc.gov socrata national
1,070 data.wa.gov socrata state
1,033 data.ny.gov socrata state
942 data.stadt-zuerich.ch ckan city-or-region
932 performance.seattle.gov socrata city
930 dati.retecivica.bz.it ckan city-or-region
915 data.cityofchicago.org socrata city
900 internal.open.piercecountywa.gov socrata county
897 performance.smcgov.org socrata county
826 data.texas.gov socrata unclassified
712 data.novascotia.ca socrata state
707 datahub.austintexas.gov socrata city
700 dataportal.aquacross.eu ckan other
672 datos.madrid.es ckan city
641 leedsdatamill.org ckan city
639 data.colorado.gov socrata unclassified
637 dados.fortaleza.ce.gov.br ckan city
631 portal.opendata.dk ckan city-or-region
606 dados.pbh.gov.br ckan city
602 data.ct.gov socrata state
562 datastore.landcareresearch.co.nz ckan other
534 niagaraopendata.ca ckan other
530 data.oregon.gov socrata unclassified
526 www.datahub.va.gov socrata national
522 datacatalog.cookcountyil.gov socrata county
492 data.uni-hannover.de ckan other
482 dados.prefeitura.sp.gov.br ckan city
473 data.montgomerycountymd.gov socrata county
454 data.buenosaires.gob.ar ckan city
443 datahub.smcgov.org socrata county
434 stat.montgomerycountymd.gov socrata county
430 data.nantou.gov.tw ckan city-or-region
422 datahub.transportation.gov socrata national
416 data.calgary.ca socrata city
412 dados.rs.gov.br ckan state
406 dati.lazio.it ckan city-or-region
404 donnees.ville.montreal.qc.ca ckan city
397 performance.commerce.gov socrata national
395 data.ok.gov ckan state
387 data.ramseycountymn.gov socrata county
378 www.data.act.gov.au socrata unclassified
376 data.pa.gov socrata state
363 data.lacity.org socrata city
352 bronx.lehman.cuny.edu socrata other
342 www.dallasopendata.com socrata city
328 internal-sandiegocounty.data.socrata.com socrata county
314 health.data.ny.gov socrata state
314 gnb.socrata.com socrata state
313 data.oaklandca.gov socrata city
303 citydata.mesaaz.gov socrata city
300 highways.hidot.hawaii.gov socrata unclassified
297 illinois-edp.data.socrata.com socrata other
288 healthdata.tn.gov socrata state
282 www.opendata-hro.de ckan city
281 data.cambridgema.gov socrata city
268 data.kingcounty.gov socrata county
263 data.mo.gov socrata state
263 performance.princegeorgescountymd.gov socrata county
249 dati.comune.matera.it ckan city
243 data.michigan.gov socrata unclassified
239 data.brla.gov socrata city
239 sharefulton.fultoncountyga.gov socrata county
235 data.winnipeg.ca socrata city
235 data.boston.gov ckan city
230 opendata.transport.nsw.gov.au ckan state
223 dados.recife.pe.gov.br ckan city
223 dados.recife.pe.gov.br ckan city
209 data.nola.gov socrata city
202 data.kcmo.org socrata city
200 data.bloomington.in.gov socrata state
199 data.zagreb.hr ckan city
180 datos.ciudaddemendoza.gob.ar ckan city-or-region
180 datos.ciudaddemendoza.gov.ar ckan city-or-region
174 data.delaware.gov socrata unclassified
172 data.vermont.gov socrata unclassified
170 data.sanjoseca.gov ckan city
161 opendata.unex.es ckan other
160 usc.data.socrata.com socrata other
153 data.bts.gov socrata unclassified
151 transparenz.karlsruhe.de ckan city
147 datahub.hhs.gov socrata national
147 cos-data.seattle.gov socrata city
141 www.transparentrichmond.org socrata city
135 data.princegeorgescountymd.gov socrata county
134 healthdata.nj.gov socrata state
134 data.sustainablesm.org socrata city
131 data.sccgov.org socrata unclassified
124 opendata.howardcountymd.gov socrata county
121 data.providenceri.gov socrata city
121 data.everettwa.gov socrata city
117 opendata.gov.je ckan national
114 data.nj.gov socrata state
112 fusioncenter.nhit.org socrata unclassified
103 data.norfolk.gov socrata city
102 data.cincinnati-oh.gov socrata city
99 educationtocareer.data.mass.gov socrata unclassified
97 bythenumbers.sco.ca.gov socrata state
94 celebratingcities.data.socrata.com socrata other
91 corstat.coronaca.gov socrata unclassified
89 data.cityofgainesville.org socrata city
87 controllerdata.lacity.org socrata city
84 data.wcad.org socrata unclassified
80 opendata.fcgov.com socrata unclassified
78 performance.fultoncountyga.gov socrata county
73 performance.ci.janesville.wi.us socrata city
72 data.honolulu.gov socrata unclassified
71 www.opendata.hu ckan unclassified
71 opendata.hu ckan other
68 gainesville-govstat.demo.socrata.com socrata city
65 opendata.ugr.es ckan unclassified
64 performance.cityofcamas.us socrata city
63 datos.jus.gov.ar ckan national
60 data.roseville.ca.us socrata city
56 opendata.fcc.gov socrata unclassified
56 transparencyarchive.michigan.gov socrata unclassified
56 dados.portoalegre.rs.gov.br ckan state
53 data.energystar.gov socrata unclassified
52 data.orcities.org socrata unclassified
48 internal-data.ct.gov socrata state
48 ckan.jbrj.gov.br ckan national
47 data.marincounty.gov socrata county
46 data.macoupincountyil.gov socrata county
45 data.datacenterresearch.org socrata unclassified
44 data.cityofberkeley.info socrata city
42 janesville.data.socrata.com socrata city
39 data.dumfriesva.gov socrata national
39 internal.opendata.clermontauditor.org socrata unclassified
37 data.weho.org socrata unclassified
35 performance.cityofrc.us socrata city
33 data.somervillema.gov socrata city
32 datahub.usac.org socrata unclassified
31 data.richmondgov.com socrata city
31 data.auburnwa.gov socrata unclassified
31 mi-treasury.data.socrata.com socrata other
30 dashboard.plano.gov socrata unclassified
30 mesa-az.demo.socrata.com socrata other
29 mischooldata.data.socrata.com socrata other
28 data.countyofriverside.us socrata county
27 data.cityoforlando.net socrata city
25 datadiscovery.nlm.nih.gov socrata unclassified
25 data.framinghamma.gov socrata unclassified
25 fortlauderdale.data.socrata.com socrata other
24 data.sonomacounty.ca.gov socrata state
23 data.nasa.gov socrata national
21 www.thedatazone.ca socrata unclassified
21 covid19.buffalony.gov socrata city
20 cthru.data.socrata.com socrata other
19 data.readingpa.gov socrata unclassified
19 carsoncity.data.socrata.com socrata other
18 data.cstx.gov socrata unclassified
18 data.fultoncountyga.gov socrata county
18 data.mesaaz.gov socrata city
17 priv-data.ojp.usdoj.gov socrata unclassified
17 datamgmt.nassaucountyny.gov socrata county
17 ptsd-va.data.socrata.com socrata other
16 hicscdata.hawaii.gov socrata unclassified
15 data.waterpointdata.org socrata unclassified
15 data.urbanaillinois.us socrata unclassified
15 fiscalfocus.pittsburghpa.gov socrata city
13 auditor-ca.demo.socrata.com socrata other
12 performance.cookcountyil.gov socrata county
12 data.miamigov.com socrata unclassified
11 policedata.coloradosprings.gov socrata unclassified
11 policeview.johnscreekga.gov socrata unclassified
11 nvof-open.data.socrata.com socrata other
10 data.fortworthtexas.gov socrata unclassified
9 openperformance.edmonton.ca socrata city
9 cookcounty.data.socrata.com socrata county
9 data.oce.pr.gov socrata unclassified
8 cityofcamas.demo.socrata.com socrata city
8 pinellasparkpd.data.socrata.com socrata other
8 dados.pb.gov.br ckan unclassified
7 datosabiertos.rivasciudad.es ckan city-or-region
6 metroairports.data.socrata.com socrata other
6 atlanta.data.socrata.com socrata other
6 cityoffairfaxpd.data.socrata.com socrata city
6 data.coloradosprings.gov socrata unclassified
5 clatsop.data.socrata.com socrata other
5 johnstonia.data.socrata.com socrata other
5 laramiecounty.data.socrata.com socrata county
5 albany.data.socrata.com socrata other
4 data.permits.performance.gov socrata unclassified
4 douglasco.data.socrata.com socrata other
4 opendata.cityofmesquite.com socrata city
4 bridgeportct.data.socrata.com socrata other
2 data.oxnard.org socrata unclassified
2 hidot-contracts.data.socrata.com socrata other
2 kirklandwa.data.socrata.com socrata city
2 www.datos.misiones.gov.ar ckan city-or-region
1 data.transportation.gov socrata national
1 parksreporting.parks.ca.gov socrata state
1 nasa-test-0.demo.socrata.com socrata national
1 openinformation.novascotia.ca socrata state
1 bronx-lehman-cuny-staging.data.socrata.com socrata other

Not responding (149)

Reachable when first surveyed, or listed in a registry, but returning no count now. Link rot in this space is severe and ongoing.

Portal Platform Error
data.gv.at ckan HTTPError
dados.gov.br ckan HTTPError
govdata.de ckan HTTPError
data.overheid.nl ckan HTTPError
data.gov.sk ckan JSONDecodeError
data.gov ckan HTTPError
opingogn.is ckan HTTPError
data.nsw.gov.au ckan HTTPError
data.gov.au ckan HTTPError
data.sa.gov.au ckan HTTPError
data.ottawa.ca ckan HTTPError
www.hri.fi ckan HTTPError
daten.berlin.de ckan HTTPError
daten.hamburg.de ckan URLError
www.daten.rlp.de ckan JSONDecodeError
opendata.comune.bari.it ckan URLError
www.opendata.provincia.roma.it ckan URLError
datagm.org.uk ckan URLError
data.denvergov.org ckan JSONDecodeError
data.cityofsantacruz.com ckan URLError
data.lexingtonky.gov ckan HTTPError
dadosabertos.senado.gov.br ckan JSONDecodeError
open-data.europa.eu ckan URLError
publicdata.eu ckan HTTPError
www.odaa.dk ckan JSONDecodeError
data.linz.gv.at ckan JSONDecodeError
data.graz.gv.at ckan HTTPError
datahub.io ckan HTTPError
offenedaten.de ckan URLError
opencolorado.org ckan HTTPError
www.opendatahub.it ckan URLError
www.nosdonnees.fr ckan URLError
hubofdata.ru ckan JSONDecodeError
datacatalogs.org ckan HTTPError
africaopendata.org ckan HTTPError
data.openva.com ckan URLError
data.ohouston.org ckan URLError
opendatadc.org ckan HTTPError
catalogue.datalocale.fr ckan URLError
data.gc.ca ckan URLError
opendatacanarias.es ckan HTTPError
data.edostate.gov.ng ckan HTTPError
datospublicos.gob.ar ckan URLError
dartportal.leeds.ac.uk ckan URLError
bermuda.io ckan URLError
opendata.cmt.es ckan URLError
dati.gov.it ckan HTTPError
data.glasgow.gov.uk ckan HTTPError
opendata.awt.be ckan JSONDecodeError
data.gov.ro ckan URLError
www.openumea.se ckan URLError
data.surrey.ca ckan JSONDecodeError
rotterdamopendata.nl ckan HTTPError
opendata.caceres.es ckan URLError
data.kk.dk ckan URLError
data.noaa.gov ckan HTTPError
data.ug ckan JSONDecodeError
datapoa.com.br ckan JSONDecodeError
data.rio.rj.gov.br ckan JSONDecodeError
opendatagortynia.gr ckan HTTPError
donnees.ville.sherbrooke.qc.ca ckan URLError
portal.openbelgium.be ckan URLError
datosabiertos.ec ckan HTTPError
www.offene-daten.me ckan URLError
udct-data.aigid.jp ckan URLError
data.grcity.us ckan HTTPError
cities.opendatahub.gr ckan URLError
opendatahub.gr ckan URLError
www.civicdata.io ckan JSONDecodeError
ckan.gsi.go.jp ckan URLError
oppnadata.se ckan URLError
dataforjapan.org ckan URLError
data.yokohamaopendata.jp ckan URLError
datameti.go.jp ckan URLError
www.data.go.jp ckan HTTPError
ckan.sabae.jrrk.org ckan URLError
opendata.lisra.jp ckan URLError
www.amsterdamopendata.nl ckan URLError
gisdata.mn.gov ckan JSONDecodeError
data.salzburgerland.com ckan URLError
geothermaldata.org ckan URLError
annuario.comune.fi.it ckan HTTPError
data.bris.ac.uk ckan TimeoutError
drdsi.jrc.ec.europa.eu ckan RemoteDisconnected
opendatareno.org ckan URLError
data.tainan.gov.tw ckan HTTPError
hdx.rwlabs.org ckan URLError
dati.openexpo2015.it ckan HTTPError
datos.gov.py ckan JSONDecodeError
datos.santander.es ckan HTTPError
data.go.id ckan HTTPError
130.179.67.140 ckan URLError
dados.al.gov.br ckan HTTPError
etsin.avointiede.fi ckan URLError
datahub.cmap.illinois.gov ckan HTTPError
opendata.riik.ee ckan URLError
catalogue.data.gov.bc.ca ckan JSONDecodeError
data.vic.gov.au ckan HTTPError
opendata.aachen.de ckan URLError
dados.ima.sp.gov.br ckan URLError
taijiang.tw ckan URLError
data.wu.ac.at ckan URLError
data.barrowbc.gov.uk ckan URLError
www.opendatabc.ca ckan URLError
opendataportal.at ckan JSONDecodeError
data.gov.hr ckan JSONDecodeError
data.suwon.go.kr ckan JSONDecodeError
go.arenysdemunt.cat ckan URLError
datar.noip.me ckan URLError
ecaidata.org ckan URLError
www.ecds.se ckan URLError
data.wa.gov.au ckan HTTPError
data-gov-ua.org ckan URLError
www.europeandataportal.eu ckan JSONDecodeError
data.gov.bf ckan URLError
www.datarefuge.org ckan HTTPError
opendata.praha.eu ckan JSONDecodeError
datos.labcd.mx ckan HTTPError
catalogo.governoaberto.sp.gov.br ckan URLError
yuj.it ckan URLError
www.fsl.com ckan HTTPError
52.34.40.179 ckan URLError
www.wprdc.org ckan HTTPError
dados.contraosagrotoxicos.org ckan HTTPError
energydata.uct.ac.za ckan URLError
www.opendatanetwork.it ckan URLError
dados.ufrn.br ckan URLError
www.donneesquebec.ca ckan HTTPError
data.jrc.ec.europa.eu ckan HTTPError
data.brisbane.qld.gov.au ckan HTTPError
datos.alcobendas.org ckan HTTPError
magonia.ibict.br ckan URLError
data.illinois.gov ckan HTTPError
opendata.ozwillo.com ckan URLError
prato-tet.routetopa.eu ckan URLError
dublin-tet.routetopa.eu ckan URLError
search.vi-seem.eu ckan URLError
data.industrie.gov.tn ckan URLError
www.opendatanepal.com ckan URLError
trouver.datasud.fr ckan URLError
opendata.oorlogsbronnen.nl ckan URLError
ckan.dataplatform.nl ckan URLError
ckan.parchemins.bzh ckan URLError
www.dataplatform.nl ckan URLError
portal0.cf.opendata.inter.sandbox-toronto.ca ckan URLError
demo.ckan.org ckan HTTPError
datos.gob.sv ckan URLError
www.adere.org.ar ckan URLError
barcelona.cat ckan HTTPError