GeoNames Addresses GeoCoding and Reverse GeoCoding

Reverse Address Geocoding Webservice

Find nearest Address

Finds the nearest street and address for a given lat/lng pair.

Url : api.geonames.org/address?
Parameters : lat,lng; radius in m (default=100); maxRows (default=1)
Restriction : this webservice is only available for selected countries, see list below.
Result : returns the nearest address for the given latitude/longitude.
Example http://api.geonames.org/address?lat=52.358&lng=4.881&username=demo

This service is also available in JSON format :
http://api.geonames.org/addressJSON?lat=52.358&lng=4.881&username=demo

Address Geocoding Webservice

Find lat/lng for Address

Returns the location lat/lng for a given address.

Url : api.geonames.org/geoCodeAddress?
Parameters : q (query term, url encoded)
Optional Parameters: country (iso countrycode), postalcode
Restriction : this webservice is only available for selected countries, see list below.
Result : returns the nearest address for the given latitude/longitude.
Example http://api.geonames.org/geoCodeAddress?q=Museumplein+6+amsterdam&username=demo

This service is also available in JSON format :
http://api.geonames.org/geoCodeAddressJSON?q=Museumplein+6+amsterdam&username=demo

Streetname Lookup Webservice

Autocomplete Streetnames

Returns a list of streets which start with the search term.

Url : api.geonames.org/streetNameLookup?
Parameters : q (query term, url encoded)
Optional Parameters: country (iso countrycode), postalcode, adminCode1, adminCode2, adminCode3, isUniqueStreetName (duplicate street names are filtered, the placename will be empty when the same street name occurs at different places)
Restriction : this webservice is only available for selected countries, see list below.
Result : returns a list of street names starting with the query term.
Example http://api.geonames.org/streetNameLookup?q=Museum&username=demo

This service is also available in JSON format :
http://api.geonames.org/streetNameLookupJSON?q=Museum&username=demo

Supported Countries

	CC	Country	num Addr/Streets	Data Providers
1	AT	Austria	2395351	National Address Register
2	AU	Australia	15481386	National Address Register
3	AX	Aland	31265	National Address Register
4	CC	Cocos [Keeling] Islands	363	National Address Register
5	CH	Switzerland	3105535	National Address Register
6	CL	Chile	1850552	National Address Register
7	CX	Christmas Island	1112	National Address Register
8	CZ	Czechia	2913321	National Address Register
9	DK	Denmark	2500538	National Address Register
10	EE	Estonia	1264183	National Address Register
11	ES	Spain	11306734	National Address Register
12	FI	Finland	3488721	National Address Register
13	FR	France	23922395	National Address Register
14	GF	French Guiana	60105	National Address Register
15	GP	Guadeloupe	130680	National Address Register
16	HK	Hong Kong	178543	National Address Register
17	IS	Iceland	115659	National Address Register
18	LU	Luxembourg	166725	National Address Register
19	MQ	Martinique	100645	National Address Register
20	NF	Norfolk Island	2162	National Address Register
21	NL	Netherlands	10124592	National Address Register
22	NO	Norway	2458623	National Address Register
23	PL	Poland	7688758	National Address Register
24	PR	Puerto Rico	491451	US Census, street segments
25	PT	Portugal	3478540	National Address Register
26	RE	Reunion	323387	National Address Register
27	SG	Singapore	141956	National Address Register
28	SI	Slovenia	559413	National Address Register
29	SJ	Svalbard and Jan Mayen	797	National Address Register
30	SK	Slovakia	1218439	National Address Register
31	US	United States	67371044	US Census, street segments
32	YT	Mayotte	35399	National Address Register