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1874 Plat Maps Keokuk County of Iowa

1882 Iowa State Gazetteer and Business Directory

1887 Plat Maps Keokuk County of Iowa

1895 U.S. Atlas - Iowa (Wayback Machine)

Scanned images of county and state maps, index of towns.

1905 Plat Maps Mahaska County of Iowa

1912 Plat Maps Keokuk County of Iowa

1913 Plat Maps Mahaska County of Iowa

1914 Plat Maps Keokuk County of Iowa

1914 Plat Maps Mahaska County of Iowa

1920 Plat Maps Mahaska County of Iowa

Ancestry.com - Search Maps, Atlases & Gazetteers

Ancestry.com has searchable indexes; database results and some digitized images are available with a fee-based subscription.

Ancestry.com - U.S., Historic Land Ownership and Reference Atlases, 1507-2000 $

Original source: Historic Map Works LLC, Portland, Maine. Ancestry.com has searchable indexes; database results and some digitized images are available with a fee-based subscription. Free articles and helpful research materials.

Ancestry.com - U.S., Indexed County Land Ownership Maps, 1860-1918 $

Original source: Various publishers of County Land Ownership Atlases. Microfilmed by the Library of Congress, Washington, D.C. Ancestry.com has searchable indexes; database results and some digitized images are available with a fee-based subscription. Free articles and helpful research materials.

Ancestry.com - U.S., Indexed Early Land Ownership and Township Plats, 1785-1898 $

Original source: Public Land Survey Township Plats, compiled 1789. Ancestry.com has searchable indexes; database results and some digitized images are available with a fee-based subscription. Free articles and helpful research materials.

Arphax Publishing Co. - Home of the Family Maps Land Patent Books

The Family Maps Land Patent Books are published county by county, state by state. Data for each county is compiled from the Federal Land Patents database and displayed in these customized books. All books include a Patent Map and Patent Index for each of the Congressional Townships within the county. Deluxe Editions also include for each Township: a Road Map and a Historical Map, which includes waterways, watercourses & railroads. The Road and Historical Maps also include city-centers and cemeteries that can be found at NationalAtlas.gov. All books contain a separate Surname/Patent Index and a Surname/Township Index to help you dive into the right area of the county to find the location of your ancestor's federal land purchase. Family Maps books are a helpful visual reference tool that makes your federal lands research easier than ever.

Atlas of Historical County Boundaries

From the Newberry Library, Chicago, Illinois. Includes for each state: Interactive Map; Index of County and Equivalents; Consolidated Chronology; Individual County Chronologies; Bibliography and Sources; Historical Commentary; Metadata - Summary Form; Metadata - Full FGDC Form; Download GIS Files; Download KMZ Files; Download PDF Files.

Color Landform Atlas: Iowa

Including a map of counties and a map for 1895.

David Rumsey Historical Map Collection - Iowa ^FREE

This free collection focuses on rare 18th and 19th century maps of North and South America, although it also has maps from around the world. The collection dates from about 1700 to the 1950s. There are now more than 48,000 items online, with new additions added regularly.

FamilySearch Wiki - Iowa Maps

Geology.com - Iowa Lake Map, River Map and Water Resources

Note the waterways displayed on a map with county boundaries. Migration paths from county to county can often be traced along these waterways.