Genealogist Essentials
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The Go-To Place for genealogists wanting to grow their business.
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Historical U.S. Counties Auto-Checker
While searching Ancestry & FamilySearch, auto-checks county and place, notes boundary changes, shows historical county maps
Users2KCurrent public install base
Rating5.0Store average score
Reviews8Public review volume
Manifest versionV3Extension platform version
7-day growth--Net users gained this week
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6 assetsHistorical U.S. Counties Auto-Checker Media preview
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5.00
Latest
5.00
30-day rating change
0.00
2026年6月30日2026年7月6日
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Version4.76
ManifestV3
Size5.97MiB
Languages1English
Published
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Last crawled
English
Overview
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Let this tool do the location work for you as you search on Ancestry.com or FamilySearch.org.
Optional upgrade for Ancestry.com users: Tree Fact-Checking and LifeMap!
U.S. county boundaries have changed over 17,600 times since America was settled in colonial times. Don’t sabotage your search for ancestors by not knowing the correct county for the historical years you are researching.
While searching on Ancestry or FamilySearch, this Historical U.S. Counties Auto-Checker extension for Google Chrome automatically checks that the county existed in the year you are searching, checks for valid places, warns of boundary changes, and links to historical county lines on Google Maps for the place and years you are searching!
Install today and never let an ancestor fall off the map again!
The Historical U.S. Counties Auto-Checker Chrome extension makes use of the award-winning randymajors.org Research Hub’s Historical U.S. Counties on Google Maps tool, underpinned with the complete dataset of the authoritative Newberry Atlas of Historical County Boundaries.
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Reviews with text5Synced review bodies
Total reviews8Chrome Web Store public rating/review count
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I just wanted to say thank you for your hard work! It is appreciated.
This extension on Microsoft Edge browser is changing the way I work. I am solving mysteries, eliminating confusion, and de-duplicating places, plantations, farms, ambiguous names, and non-populated areas more than ever before and with MUCH less effort. As you state, the data is already out there, but your website and extensions make it much easier to access and use, more than any process or tool that I’ve ever tried. For decades, I’ve avoided fixing these places and now I’m tackling it head-on.
As I librarian I wholeheartedly support this Chrome extension! We have installed it on all of our genealogy computers at the library because it works for AncestryLibrary Edition too! So easy to use and is extremely helpful when searching older records. Once you've identified an accurate place name for a specific time period you will then be able to search other databases with that same location to open up much more information in your research.
This is a great extension. So easy to use and super quick. Enabled me to find some info I had been struggling with before because the county didn't exist in the year I was searching. Who knew?
Excellent Chrome extension! It makes it so easy to find county location mistakes when searching on Ancestry.com. It helped me uncover several census and other records that I didn't know existed for my great great grandfather. Now that this extension exists, I won't search on Ancestry without it!