HEATKEYS

Find latitude and longitude of any known location by clicking it on a map or entering zip codes or addresses. Batch geocode a list of locations. Convert decimal degrees to degrees minutes seconds and vice versa.

Proximity/MESA is a leader in decision support system software, modeling, databases and information technology. This site features free data access, GIS software, on-line data analysis, user support, training, demos, geographic data.

New district matching, data, API and batch address processing and mapping for 113th congressional and new State legislative districts

A simple yet modern discussion forum for land surveyors.

For data quality management tools, mailing software, consumer and residential mailing lists, address verification, and NCOA services, visit MelissaData.com, a leading source of cost effective, direct marketing database solutions.

Commercial ZIP code database software - Rated #1 - with area code, county, latitude, longitude, MSA, PMSA, FIPS code, and timezone. Updated monthly.

Online Reverse Lookup Directory contains list of useful websites for reverse lookup services listed under their respective relevant categories.

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IMPLAN, Economic Impact Analysis

ZIP Code Database list & Demographics - ZIP Codes by City with Boundary Data - Free ZIP Code Finder - or Download the Data - Maps, Zip Codes, Area Codes, Household Income, Current Population, Multi County Data, Postal codes, MSA codes, CBSA codes...

A free and open source web-based GIS application portal for geocoding, geocode correction, address validation, and data capture

Musings of a web developer, data journalist, historian, and cat herder from Baltimore.

NationBuilder is the essential toolkit for leaders.