GeoNames WebServices overview

	WebService	XML	JSON	RDF	CSV	TXT	RSS	KML
1	astergdem	XML	JSON			TXT
2	children	XML	JSON
3	contains	XML	JSON
4	countryCode	XML	JSON			TXT
5	countryInfo	XML	JSON		CSV
6	countrySubdivision	XML	JSON
7	earthquakes	XML	JSON
8	extendedFindNearby	XML
9	findNearby	XML	JSON
10	findNearbyPlaceName	XML	JSON
11	findNearbyPostalCodes	XML	JSON
12	findNearbyStreets	XML	JSON
13	findNearbyStreetsOSM	XML	JSON
14	findNearByWeather	XML	JSON
15	findNearbyWikipedia	XML	JSON				RSS
16	findNearestAddress	XML	JSON
17	findNearestIntersection	XML	JSON
18	findNearestIntersectionOSM	XML	JSON
19	findNearbyPOIsOSM	XML	JSON
20	address	XML	JSON
21	geoCodeAddress	XML	JSON
22	streetNameLookup	XML	JSON
23	get	XML	JSON
24	gtopo30	XML	JSON			TXT
25	hierarchy	XML	JSON
26	neighbourhood	XML	JSON
27	neighbours	XML	JSON
28	ocean	XML	JSON
29	postalCodeCountryInfo	XML	JSON
30	postalCodeLookup		JSON
31	postalCodeSearch	XML	JSON
32	rssToGeo						RSS	KML
33	search	XML	JSON	RDF
34	siblings	XML	JSON
35	srtm1	XML	JSON			TXT
36	srtm3	XML	JSON			TXT
37	timezone	XML	JSON
38	weather	XML	JSON
39	weatherIcao	XML	JSON
40	wikipediaBoundingBox	XML	JSON
41	wikipediaSearch	XML	JSON
	Total	39	39	1	1	5	2	1

Some webservices above (the US/OSM reverse-geocoders and address lookups) are only available for limited regions.