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Welcome to Allen County ...

Time Zone: Allen County lies in the Eastern Time Zone (EST/EDT) and observes daylight saving time.

The community of Lima is the Seat for Allen County.

Allen County was founded March 1, 1820 and was created by taking area from Shelby County.

From the Census Estimates for 2019, <1> Allen had a population of 102,351 people. This is a decrease of 3.77% since the last Census (which gave a population of 106,358 people in 2010).

At the time of the 2010 Census, Allen represented 0.92% of the total population of Ohio.

Below are some of the communities located in Allen County:

  • Beaverdam
    (8 miles [12.9 km] to the northeast)
    • Note: The GPS coordinates that we are using for Beaverdam have been provided by the GNIS.<2> The coordinates still need to be verified.
    • Jump to our Gazetteer entry for Beaverdam
    • Beaverdam is located in Allen County (OH)
    • Population from the 2020 Census: 369 people
    • Jump to TripAdvisor's Tourism page for Beaverdam <3>
  • Bluffton
    (14 miles [22.5 km] to the northeast)
  • Cairo
    (4 miles [6.4 km] to the north)
    • Note: The GPS coordinates that we are using for Cairo have been provided by the GNIS.<2> The coordinates still need to be verified.
    • Jump to our Gazetteer entry for Cairo
    • Cairo is located in Allen County (OH)
    • Population from the 2020 Census: 520 people
  • Delphos
    (12 miles [19.3 km] to the northwest)
    • Jump to our Gazetteer entry for Delphos
    • Delphos is located in Allen County (OH)
    • Population from the 2020 Census: 6,895 people
    • Jump to TripAdvisor's Tourism page for Delphos <3>
  • Elida
    (4 miles [6.4 km] to the west)
    • Note: The GPS coordinates that we are using for Elida have been provided by the GNIS.<2> The coordinates still need to be verified.
    • Jump to our Gazetteer entry for Elida
    • Elida is located in Allen County (OH)
    • Population from the 2020 Census: 1,810 people
  • Harrod
    (11 miles [17.7 km] to the east)
    • Jump to our Gazetteer entry for Harrod
    • Harrod is located in Allen County (OH)
    • Population from the 2020 Census: 406 people
    • Jump to TripAdvisor's Tourism page for Harrod <3>
  • Lafayette
    (8 miles [12.9 km] to the east)
  • Lima
    (Less than 2 miles to the south)
    • Jump to our Gazetteer entry for Lima
    • Lima is located in Allen County (OH)
    • Population from the 2020 Census: 36,440 people
    • Jump to TripAdvisor's Tourism page for Lima <3>
  • Spencerville
    (12 miles [19.3 km] to the west)

Websites of Interest ...

Footnotes ...

<1>On a yearly basis, the US Census Bureau creates an estimate of the county's population. Keep in mind that this is an estimate and not an actual count. The last physical count was the 2010 Census and the next count will be for the 2020 Census.
<2>The location has been supplied by the Geographic Names Information System - which is maintained by the U.S. Geological Survey (USGS). While these values should be definitive, we found that accuracy can vary and you should double-check the location if accuracy is required.
<3>While we're fans and frequent users of TripAdvisor, you should know that we're also members of the TripAdvisor affiliate program.
 

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This page was last modified/updated: 15 Jul 2025