When was Hillsborough County founded?

Hillsborough County was founded in 1834, formed from Alachua County.

Is there an online parcel map for Hillsborough County?

Yes. Hillsborough County publishes a parcel map of 531,612 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.

Has Hillsborough County's boundary or name changed?

Hillsborough County was created in 1834 from Alachua County. Since then the Atlas of Historical County Boundaries records 11 later changes, chiefly involving Hernando County, Polk County and Benton County.

Is my lot in a flood zone?

We do not have flood maps for Hillsborough County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

County · code 12057

Hillsborough CountyFlorida

Hillsborough County is a Florida county created in 1834 as part of the Florida Territory. With a population of 1,459,762 as of 2020, it covers 1,021.9 square miles.

Founded1834
Land area1,022 sq mi + 310 sq mi water
Population1,459,762 2020 Census
Parcels mapped531,612 checked 14 October 2026

Open the free map Click any parcel in Hillsborough County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated 19 October 2026

Census outline

History

Formed in 1834 from Alachua County

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

Hillsborough County was created on January 25, 1834, from Alachua County and former Indian lands. Over the following decades, the county lost land to the creation of several new counties: Hernando in 1843, Marion and the original St. Lucie (now Brevard) in 1844, Manatee in 1855, Polk in 1861, Pinellas in 1911, and small areas to other counties at various dates.

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

1834
Hillsborough County created Hillsborough created by Florida Territory from Alachua and former Indian lands (non-county area).
from Alachua
25 January 1834 · Fla. Terr. Acts 1834, 12th sess., ch. 764/p. 46
1843
Lost territory Hillsborough lost to creation of Hernando.
to Hernando
24 February 1843 · Fla. Terr. Acts 1843, 21st sess., no. 51/p. 48
1844
Lost territory Hillsborough lost to Benton (now Hernando).
to Bentonto Hernando
6 March 1844 · Fla. Terr. Acts 1844, 22d sess., p. 16
1844
Lost territory Hillsborough lost to creation of Marion and St. Lucie (original, now Brevard), and apparently lost to Mosquito (now Orange).
to Marion to St. Lucie to Brevard to Mosquitoto Orange
14 March 1844 · Fla. Terr. Acts 1844, 22d sess., pp. 31, 43
1847
Gained territory Hillsborough gained from Benton (now Hernando).
from Bentonfrom Hernando
1 January 1847 · Fla. Laws 1846, 2d sess., ch. 107/p. 63

Show all 12 changes (7 more)

1834
Hillsborough County created Hillsborough created by Florida Territory from Alachua and former Indian lands (non-county area).
from Alachua
25 January 1834 · Fla. Terr. Acts 1834, 12th sess., ch. 764/p. 46
1843
Lost territory Hillsborough lost to creation of Hernando.
to Hernando
24 February 1843 · Fla. Terr. Acts 1843, 21st sess., no. 51/p. 48
1844
Lost territory Hillsborough lost to Benton (now Hernando).
to Bentonto Hernando
6 March 1844 · Fla. Terr. Acts 1844, 22d sess., p. 16
1844
Lost territory Hillsborough lost to creation of Marion and St. Lucie (original, now Brevard), and apparently lost to Mosquito (now Orange).
to Marion to St. Lucie to Brevard to Mosquitoto Orange
14 March 1844 · Fla. Terr. Acts 1844, 22d sess., pp. 31, 43
1847
Gained territory Hillsborough gained from Benton (now Hernando).
from Bentonfrom Hernando
1 January 1847 · Fla. Laws 1846, 2d sess., ch. 107/p. 63
1855
Lost territory Hillsborough lost to creation of Manatee.
to Manatee
9 January 1855 · Fla. Laws 1854, 7th sess., ch. 628/p. 47
1861
Lost territory Hillsborough lost to creation of Polk.
to Polk
8 February 1861 · Fla. Laws 1860, 10th sess., ch. 1201/p. 192; Fla. Rpts., 120:429-431
1866
Gained territory Hillsborough gained small area from Polk to accommodate local resident.
from Polk
10 December 1866 · Fla. Laws 1866, 14th sess., ch. 1622/p. 82
1866
Lost territory Hillsborough lost to Sumter.
to Sumter
13 December 1866 · Fla. Laws 1866, 14th sess., ch. 1589/p. 61
1874
Lost territory Hillsborough lost to Polk.
to Polk
19 February 1874 · Fla. Laws 1874, 7th sess., ch. 1998/p. 63
1911
Lost territory Hillsborough lost to creation of Pinellas.
to Pinellas
14 November 1911 · Fla. Laws 1911, 13th sess., ch. 6247, secs. 1, 20-21/pp. 219, 223; Grismer, St. Petersburg, 35; HRS Fla., Pinellas, 9
1939
Lost territory Hillsborough lost small area (Mullet Key) to Pinellas.
to Pinellas
15 May 1939 · Fla. Laws 1939, 27th sess., gen., ch. 19058/p. 116

Land and parcels

What the maps cover in Hillsborough

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

Parcels Good enough

Lot lines and tax-map numbers for 531,612 parcels from Hillsborough County. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
checked 14 October 2026
Address points Missing

No public address points layer found for Hillsborough County yet.
Buildings Reference

Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026

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

Hillsborough by the Census

Population

1,459,762 2020 Census count

Housing units

602,886 2020 Census count

Land area

1,022 square miles

Water area

310 square miles

People per sq mi

1,428 population ÷ land area

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

See your own lot on these maps

Open Hillsborough 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.

Open the free map no sign-in Pro early access

Questions

Common questions about Hillsborough County

When was Hillsborough County founded?: Hillsborough County was founded in 1834, formed from Alachua County.
Is there an online parcel map for Hillsborough County?: Yes. Hillsborough County publishes a parcel map of 531,612 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Hillsborough County's boundary or name changed?: Hillsborough County was created in 1834 from Alachua County. Since then the Atlas of Historical County Boundaries records 11 later changes, chiefly involving Hernando County, Polk County and Benton County.
Is my lot in a flood zone?: We do not have flood maps for Hillsborough County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

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