I’ve tried a handful of API keys and have them coming each time.
Here are some examples from Ukraine:
{
"name": "Dnipropetrovsk",
"woeid": 918981,
"placeType": {
"name": "Town",
"code": 7
},
"country": "Ukraine",
"url": "http://where.yahooapis.com/v1/place/918981",
"countryCode": "UA",
"parentid": 23424976
},
{
"name": "Donetsk",
"woeid": 919163,
"placeType": {
"name": "Town",
"code": 7
},
"country": "Ukraine",
"url": "http://where.yahooapis.com/v1/place/919163",
"countryCode": "UA",
"parentid": 23424976
},
{
"name": "Kharkiv",
"woeid": 922137,
"placeType": {
"name": "Town",
"code": 7
},
"country": "Ukraine",
"url": "http://where.yahooapis.com/v1/place/922137",
"countryCode": "UA",
"parentid": 23424976
},
{
"name": "Kyiv",
"woeid": 924938,
"placeType": {
"name": "Town",
"code": 7
},
"country": "Ukraine",
"url": "http://where.yahooapis.com/v1/place/924938",
"countryCode": "UA",
"parentid": 23424976
},
{
"name": "Lviv",
"woeid": 924943,
"placeType": {
"name": "Town",
"code": 7
},
"country": "Ukraine",
"url": "http://where.yahooapis.com/v1/place/924943",
"countryCode": "UA",
"parentid": 23424976
},
{
"name": "Odesa",
"woeid": 929398,
"placeType": {
"name": "Town",
"code": 7
},
"country": "Ukraine",
"url": "http://where.yahooapis.com/v1/place/929398",
"countryCode": "UA",
"parentid": 23424976
},
{
"name": "Zaporozhye",
"woeid": 939628,
"placeType": {
"name": "Town",
"code": 7
},
"country": "Ukraine",
"url": "http://where.yahooapis.com/v1/place/939628",
"countryCode": "UA",
"parentid": 23424976
},
Are you using any other parameters when you make the request?