According to Harper's Magazine, May 2005 edition,
Page 11 - the Harper's Index, there are at least 18
midwestern towns offering free land to new residents.

I located 8 of them in Kansas, an easy find through Gooogle.

Please locate for me the other 10... Thanks!

Hello, atr:

This question was asked last year: 
http://answers.google.com/answers/threadview?id=320039. It mentions
the Kansas towns that you already know about; lots of information
about the pros and cons of moving to the rural Midwest.

Here's a more recent USA Today article about this phenomenon:
http://www.usatoday.com/news/nation/2005-02-08-land-cover_x.htm?csp=24&RM_Exclude=Juno

I've found just two more that are not in Kansas: Kenesaw, Nebraska and
Crosby, North Dakota. There are some others in Nebraska mentioned
under "hometown comptetiveness" but the sites I've read on line so far
don't specifically mention  free land, just that they are trying to
persuade people to move there: Ord, David City, Mullen, and Hyannis.

Wikipedia has entries for each state and they specify these which have
an entry about "rural flight" - Nebraska, Kansas, North Dakota, South
Dakota, Iowa, and Oklahoma: i.e.

"Rural flight

Oklahoma, in common with five other Mid-West states (Nebraska, Kansas,
North Dakota, South Dakota and Iowa), is feeling the brunt of falling
populations. 89% of the total number of cities in those states have
fewer than 3000 people; hundreds have fewer than than 1000. Between
1996 and 2004 almost half a million people, nearly half with college
degrees, left the six states. "Rural flight" has led to offers of free
land and tax breaks as enticements to newcomers in some of these
states.

The effects of rural flight in Oklahoma have mostly been felt in
Western Oklahoma (those areas west of I-35)." No specific towns are
mentioned in the Wikipedia entries. I'll keep looking.

Have you tried this, there is a commercial link as well.

http://www.kansasfreeland.com/

The city of Harper KS is working on theirs as well, however it is not
posted.  If you are interested I can let you know when it does.  Not
sure what your interest is in the land info, if it is to build or pass
to someone wanting to build make sure they are aware of NRP, not all
communities have this.  This is a prorated tax on the property over 10
years.  Here is the link to Harper County, KS and what they have in
place.  About 2/3 down is the schedule for commercial and residential.
 Don't be overwhelmed by all of the print.  Bottom line it is a good
deal especially if you incur specials on your property to offset a new
development, etc.

http://harpercountyks.gov/index.asp?NID=130

Hope this helps.