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County · code 21167

Mercer CountyKentucky

Mercer County is a county in Kentucky with its seat in Harrodsburg. It was created in 1786 and named after Hugh Mercer.

  • Founded1786
  • County seatHarrodsburg
  • Named forHugh Mercer
  • Land area249 sq mi + 4.2 sq mi water
  • Population22,641 2020 Census
  • Parcels mapped12,179 checked 14 October 2026
Open the free map Click any parcel in Mercer County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

BoyleAndersonWoodfordJessamineWashingtonGarrard Harrodsburg Census outline · seat marked

Where it is

Mercer on the map of Kentucky

Kentucky has 120 counties and county equivalents, each with its own records office. Shapes with a page are links.

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Counties of Kentucky · Mercer highlighted

History

Formed in 1786 from Lincoln County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Mercer County was created by Virginia from Lincoln County in 1786. When Kentucky became a state in 1792, Mercer became a Kentucky county. Over the following decades, the county's boundaries changed as neighboring counties were created from its territory, including Franklin in 1795, Garrard in 1797, Anderson in 1827, and Boyle in 1842, while it also gained small areas from neighboring counties.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries; the 5 that matter most are shown first.

  1. 1786
    Mercer County created Mercer created by Virginia from Lincoln.
    from Lincoln
    · Hening, 12:118-120
  2. 1792
    Became part of Kentucky Mercer became a Kentucky county when the state of Kentucky was created from the Kentucky District of Virginia. · Hening, 11:85; U.S. Stat., vol. 1, ch. 4 [1791]/p 189
  3. 1795
    Lost territory Mercer lost to creation of Franklin.
    to Franklin
    · Ky. Acts 1794, 3d assy., ch. 13, sec. 1/pp. 19-21
  4. 1797
    Lost territory Mercer lost to creation of Garrard.
    to Garrard
    · Ky. Acts 1796-1797, 5th assy., 1st sess., sec. 1/pp. 38-39
  5. 1821
    Gained territory Mercer gained from Casey.
    from Casey
    · Ky. Acts 1820, 29th assy., ch. 139, sec. 1/pp. 170-172
Show all 14 changes (9 more)
  1. 1786
    Mercer County created Mercer created by Virginia from Lincoln.
    from Lincoln
    · Hening, 12:118-120
  2. 1792
    Became part of Kentucky Mercer became a Kentucky county when the state of Kentucky was created from the Kentucky District of Virginia. · Hening, 11:85; U.S. Stat., vol. 1, ch. 4 [1791]/p 189
  3. 1795
    Lost territory Mercer lost to creation of Franklin.
    to Franklin
    · Ky. Acts 1794, 3d assy., ch. 13, sec. 1/pp. 19-21
  4. 1797
    Lost territory Mercer lost to creation of Garrard.
    to Garrard
    · Ky. Acts 1796-1797, 5th assy., 1st sess., sec. 1/pp. 38-39
  5. 1810
    Gained territory Mercer gained small area from Lincoln.
    from Lincoln
    · Ky. Acts 1809-1810, 18th assy., ch. 95, sec. 1/p. 8
  6. 1821
    Gained territory Mercer gained from Casey.
    from Casey
    · Ky. Acts 1820, 29th assy., ch. 139, sec. 1/pp. 170-172
  7. 1827
    Lost territory Mercer lost to creation of Anderson.
    to Anderson
    · Ky. Acts 1826-1827, 35th assy., ch. 35, sec. 1/pp. 44-47, and ch. 46, sec. 1/p. 55
  8. 1842
    Lost territory Mercer lost to creation of Boyle.
    to Boyle
    · Ky. Acts 1841-1842, ch. 189, sec. 1/pp. 39-41, and ch. 365/p. 270
  9. 1844
    Gained territory Mercer gained small area from Boyle to accommodate local property owner.
    from Boyle
    · Ky. Acts 1843-1844, ch. 271, sec. 3/pp. 50-51
  10. 1860
    Gained territory Mercer gained small area from Washington.
    from Washington
    · Ky. Acts 1859-1860, vol. 2, ch. 660, sec. 1/p. 311
  11. 1878
    Lost territory Mercer lost to Anderson.
    to Anderson
    · Ky. Acts 1877-1878, vol. 1, ch. 239, sec. 1/pp. 245-246
  12. 1884
    Lost territory Mercer lost small area to Anderson to accommodate local property owners.
    to Anderson
    · Ky. Acts 1883-1884, vol. 1, ch. 1579, sec. 1/pp. 190-191
  13. 1890
    Gained territory Mercer gained from Washington.
    from Washington
    · Ky. Acts 1889-1890, vol. 2, ch. 756, secs. 1-4, 7/pp. 508-510; vol. 3, ch. 1797, secs. 1-3/pp. 1471-1472
  14. 1890
    Gained territory Mercer gained from Anderson.
    from Anderson
    · Ky. Acts 1889-1890, vol. 3, ch. 1859, sec. 1/p. 1579

Land and parcels

What the maps cover in Mercer

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

Mercer by the Census

Population
22,641 2020 Census count
Housing units
10,338 2020 Census count
Land area
249 square miles
Water area
4.2 square miles
People per sq mi
91 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

Mercer County's official site

We have found the county's site but not its offices yet; start there.

County government

See your own lot on these maps

Open Mercer County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

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Questions

Common questions about Mercer County

When was Mercer County founded?
Mercer County was founded in 1786, formed from Lincoln County, and named after Hugh Mercer.
What is the county seat of Mercer County?
The county seat of Mercer County is Harrodsburg.
Is there an online parcel map for Mercer County?
Yes. Bluegrass Area Development District (owner BGGIS; regional council hosting the Mercer County Planning and Zoning app for its member county; org profile not public) publishes a parcel map of 12,179 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Mercer County's boundary or name changed?
Mercer County was created in 1786 from Lincoln County. Since then the Atlas of Historical County Boundaries records 13 later changes, chiefly involving Anderson County, Boyle County and Washington County.
Is my lot in a flood zone?
We do not have flood maps for Mercer County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door