Plain

Residential delivery area · Ohio

ZIP Code 45820: Cairo, OH

ZIP code 45820 is in Cairo, Ohio, entirely in Allen County (Census 2020 ZIP-county file). About 580 people live there (Census Bureau, ACS 2020-2024). Median household income is $83,125 (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020
  • FHFA2021
  • ZBP2023
4national area: Ohio, Indiana, Kentucky and Michigan
458sectional center: Columbus, OH (SCF 430)
20delivery area within it
Town
Cairo · its only residential ZIP
Census places
Cairo
Metro area
Lima, OH
House district
OH-4 119th Congress
State
Ohio
Time zone
Eastern
Land area
0.3 sq mi · 2,097 people per sq mi

Where is ZIP code 45820?

45820 centers on 40.831°, -84.084° and covers 0.3 square miles of land. It borders 1 ZIP code: 45807.

45807 · Lima45820 · Cairo (this ZIP)4582045807 · Lima45820 · Cairo (this ZIP)4582045807 · Lima45820 · Cairo (this ZIP)45820
Shaded by median household income, in national fifths (ACS 2020-2024); 45820 outlined. Census 2020 ZCTA boundaries. <$54.1k$98.1k+no figure

The map draws ZIP code areas only. For the streets inside 45820, open its center on OpenStreetMap.

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).

How does 45820 compare with the rest of Allen County?

Rank of 45820 among the residential ZIP codes of its town, county and state (1 = the most; income and home value among ZIP codes of 1,000+ people living in households)
Measure45820In Allen CountyIn OH
People (ACS 2020-2024)58116th of 191,002nd of 1,233
Median household income$83knot rankednot ranked
Median home value$115knot rankednot ranked

45820's income and home value are not ranked: it has fewer than 1,000 residents (581). Rankings use ZIP codes of 1,000 or more people living in households, with margins at most 25% of the figure.

It is denser than 85% of U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).

How many people live in 45820?

The 2020 Census counted 517 people in 45820; the ACS, which samples households over 2020-2024, estimates 581. Its boundary changed between the 2010 and 2020 censuses, so the two counts are not compared.

People, ACS 2020-2024
581±169 (90% margin)
2020 Census count
517
Households
214
Median age
35.9

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).

Who lives in 45820?

Of the 581 people the ACS estimates in 45820, 17.6% are under 18 and 15.7% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (90.5%).

  • Under 1817.6%
  • 18 to 6466.8%
  • 65 and older15.7%
Age of the people of 45820 (ACS 2020-2024, B01001)
  • White, not Hispanic90.5%
  • Hispanic or Latino5.0%
  • Asian, not Hispanic3.8%
  • Other or two or more0.7%
  • Black, not Hispanic0.0%
Race and Hispanic origin in 45820 (ACS 2020-2024, B03002); each person counted once

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.

What do households in 45820 earn?

Median household income is $83,125 (ACS 2020-2024).

Median household income
$83,125
Income per person
$33,722
Below the poverty line
6.9%
Unemployed (of the labor force)
2.0%
Adults 25+ with a bachelor's degree
20.4%

Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).

What are homes worth in 45820?

Median home value (owners' estimate)
$114,500
Median gross rent
$1,023
Homes owned by their occupants
86.4%
Housing units
239
0 50 100 150 200120102021 0 50 100 150 200120102021 0 50 100 150 200120102021
Index = 100 in 2001, the first year FHFA reports for 45820; 2021: 151.3. Annual, not seasonally adjusted; FHFA calls its ZIP-level indexes developmental. FHFA's series for 45820 stops in 2021: it publishes no ZIP index for a year with too few repeat sales.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.

What businesses are in 45820?

4 business establishments had a location in this ZIP code in 2023, 2 fewer than in 2018 (ZIP Code Business Patterns).

Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).

Which ZIP codes are next to 45820?

ZIP codes that share a boundary with 45820, then the nearest by center
ZIPTownPeopleHousehold incomeDistance
45807Lima11,774$71k4.9 mi
45893Vaughnsville160–4.7 mi (near)
45801Lima21,739$52k4.8 mi (near)
45809Gomer45–5.3 mi (near)
45830Columbus Grove5,199$81k5.4 mi (near)
45808Beaverdam350$82k5.8 mi (near)
45805Lima24,387$69k8.2 mi (near)
45804Lima13,608$45k8.5 mi (near)

Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.