The National Map Corps


TNMCorps is an online crowdsourcing mapping project with volunteers successfully editing structures in all 50 States, Puerto Rico, and the U.S. Virgin Islands

Click here to go to the The National Map Corps Editor

As part of The National Map, structures include schools, hospitals, post offices, police stations, cemeteries, and other important public buildings. By updating and verifying structures data, volunteers are making significant contributions to USGS National Structures Database, The National Map, and ultimately U.S. Topo Maps!

Video Transcript

View audio-described versionVideo courtesy of Scott Horvath, USGS Office of Communications and Publishing  (Public domain.)

Anyone with an interest in contributing can volunteer. It is easy to sign up and get started! All you need is access to the internet, an email address, and a willingness to learn. “How to” documentation including a comprehensive User Guide and a Quick Start Guide will have you up and editing quickly. Begin editing in your own hometown or anywhere in the U.S., Puerto Rico, and the U.S. Virgin Islands.

Volunteers earn virtual badges for participating and are recognized for their contributions (with permission) via USGS and National Map social media.

Follow us on Twitter @USGSTNM or #TNMCorps or LIKE us on Facebook!


Remember to add to your email account's list of approved senders. 

TNMCorps regularly interacts with volunteers via Interactions include virtual badges earned, newsletters, and additional guidance. If you're not receiving our messages, it's possible that they're getting caught by a spam filter. To ensure that our messages get through, add to your email account's list of approved senders. We also recommend using a personal email account when signing up since institutional accounts (i.e., *.edu, etc.) tend to have universal filters that prevent our messages from coming through.



Click here for TNMCorps Newsletters




Date published: September 16, 2021

Mapping Challenge Update (09/16/21): Law Enforcement in KS & OK

Volunteers continue to make progress with 50 more edits coming in since last week - MARVELOUS!  

Date published: September 16, 2021

Mapping Challenge Update (09/16/21): Schools with No Edit History in Colorado

Phase 2 is well underway for this challenge! There's still a few schools that haven't been reverified yet, especially in Larimer, Weld, Bent, Hinsdale, Ouray, southern Alamosa, and eastern El Paso counties. 

Date published: September 16, 2021

FINISHED! TNMCorps Mapping Challenge for City / Town Halls in IA & MN

This challenge is now complete! Thanks to everyone who contributed!