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: January 21, 2021

Mapping Challenge Update (01/21/21): Schools in TX

This challenge is nearing completion with just over 300 points remaining!

Date published: January 21, 2021

Mapping Challenge Update (01/21/21): City / Town Halls in CA & NV

Volunteers continue to make headway on this challenge with another 40 points added since last week.  However, there are a handful of communities in the metropolitan areas that still need a point. See our spatial analyses for tips on which communities these may be. 

Date published: January 14, 2021

Mapping Challenge Update (01/14/21): City / Town Halls in CA & NV

Volunteers jumped in feet first with almost 30 new points added since last week. That's pretty good, considering volunteers need to sift through what's already on the map versus what still needs to be collected.  Keep up the good work!!