I need to geocode around 200 addresses per request and do around 3,000 request per day. I will be doing this server side using PHP. I have looked at How to convert an address to a latitude/longitude?, but could not find a way for either Google Maps HTTP Request API or the Yahoo Geocoding REST API (cannot use JavaScript as this is server side) to send multiple addresses.
I will be primarily using this to sort addresses based on the coordinates and if the API supports, fill in any missing data for each address. The addresses will be in the United States only. The addresses to geocode will be from user input, so be free form, like "street address, postal code", or "city, state", etc. Accuracy is not too important for the coordinates, say within five hundred feet or so.
Is there a free API to handle this? Is there a way to get Yahoo or Google to do multiple locations in a request?
geocoder.us will do what you want, but you may have the same problem for bulk lookups. They do bulk lookups for a fee though.
Would GeoNames provide sufficient information, either through the bulk raw data or via their web services?