The National Map Corps
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TNMCorps Project Webpage

The National Map Corps (TNMCorps) is an online crowdsourcing mapping project with volunteers successfully editing structures data in all 50 States, Puerto Rico, and the U.S. Virgin Islands. 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 the USGS National Structures Dataset, The National Map, and ultimately U.S. Topo Maps!


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. 

TNMCorps Web Editor


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


Not Sure where to start editing?
Begin editing in your own hometown or anywhere in the U.S., Puerto Rico, and the U.S. Virgin Islands.

Our Mapping Challenges focus on a structure type within specific region and are a fun way for volunteers to have their contributions recognized.

Still not sure where to edit?  Our Structure Finder is an interactive web map that randomly selects a point for you to edit or review.

TNMCorps Structure Finder



Project Updates

10/21/19 ------------------------

Mapping Challenge Update: Cemeteries in Calhoun, Jackson, and Kalamazoo Counties, MI

Here's the weekly update for this challenge.  Only 21 unedited points remain for this challenge!  We also have 75 points that need to be confirmed by a Peer Reviewer or an Advanced Editor. 

Check out the Mapping Challenges page for more information.

10/21/19 ------------------------

Mapping Challenge Update: City/Town Halls in Ohio and West Virginia

Here's the weekly update for this challenge.  Check out our post from 9/30/19 for possible sources containing a list of cities, villages, and townships for these states. 

Check out the Mapping Challenges page for more information.

10/21/19 ------------------------

Mapping Challenge Update: Schools in Wayne County, MI

Here's the weekly update for this challenge.  This challenge is close to being finished, but not quite yet! There are still several points that we need your help with!

Check out the Mapping Challenges page for more information.

Click Here to check out more Project Updates