NEW TNMCorps Mapping Challenge for City / Town Halls in IL & MO!

Release Date:

TNMCorps Mapping Challenges shift to the Midwest with a new challenge for city/town halls in Illinois and Missouri!

As you can see from the map, some work has already been done in these states. However, there are still many points that need to be collected.

TNMCorps Mapping Challenge: City/Town Halls in IL & MO

(Public domain.)

Not Sure What Each Point Color Means?  

These border colors are part of our tiered editing system and indicate which tier the point has passed through:  

TNMCorps Point Border Colors

(Public domain.)

Our November 2018 newsletter has an article titled Editor Roles and Point Colors that describes this process further. 


Tips and tricks for this challenge:  

Local Government: Incorporated vs. Unincorporated 

  1. Municipalities in Missouri include cities, villages, and townships.   
  2. Illinois’s municipalities consist of cities, towns, and villages
  3. See the Cities vs. Towns vs. Villages article in our September 2019 newsletter for more information on the different types of governing bodies. 


Possible Sources 

  1. Remember to find an authoritative source (e.g., the city or village’s website) for each feature before adding it to the map.   
  2. See the How to Spot an Authoritative (Re)Source article in our November 2017 newsletter for more information on why this is important.   


  1. The Secretary of State’s website contains a directory of municipalities that can be filtered by county.  
  2. Wikipedia also contains a list of cities, towns, and villages.  


  1. The state’s website has a list of municipalities and corresponding websites.  
  2. Wikipedia also contains a list of municipalities in the state. 


Proper Point Placement 

Our November 2018 newsletter includes an article on aerial interpretation for city/town hall structures. This article walks you through how to identify which building to place a point on when examining aerial photography. 


Interested in collecting city/town halls elsewhere? 

We’re collecting city/town halls nationally, so feel free to research these features throughout the U.S.  Other priority states include (in order of priority) Nebraska, South Dakota, and Wyoming.  Note that only city/town halls in Missouri and Illinois will count towards this challenge.   


If you have any questions during the mapping process, reach out to us at and we’ll will be happy to assist!  Thank you for all that you do, and happy mapping!