GeoDB Cities API is best for city, region, and country data, filters cities by location and even population, and uses cloud infrastructure for outstanding performance and resilience. The City Geo-Location Lookup API is best for longitude, latitude, and time zone data for any city, with easy-to-use API features and well-documented documentation. The Redline Zipcode API is best for accurately calculating the distance between zip codes and all zip codes within a given radius, offering powerful location features and free tier users limited to 240 requests per day. The Boundaries-IO API is best for integrating multiple boundaries in GeoJSON format for your apps, with fast and straightforward API performance and pricing options starting at $27 per day for 5000 boundaries. The World Cities API is best for obtaining a list of cities that match a given search condition, providing JSON formatted results and advanced search criteria. The City Bikes API is useful for bike information and bike-sharing systems around the world, with a straightforward REST interface and free usage for all developers. The Yandex Geocoder API converts location information into physical addresses and vice versa, offering simple methods and well-formatted output. The IATACodes API provides information about International Air Transport Association codes, including city codes, airline identifications, and more, with a vast database and simple endpoint. The IP Geo Location API offers location data for IPv4 and IPv6 addresses in XML and JSON formats, with neat formatting and pricing options starting at $6.99 per day for 5000 requests. The Realty Mole Property API provides real estate information, including property owners, attributes, zip codes, and rental history, with robust search features and pricing options starting at $39 per month for 2000 requests.