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County · code 08117

Summit CountyColorado

Summit County is a Colorado county created in 1861 and seated in Breckenridge. The county takes its name from the Continental Divide of the Americas.

  • Founded1861
  • County seatBreckenridge
  • Named forContinental Divide of the Americas
  • Land area608 sq mi + 11 sq mi water
  • Population31,055 2020 Census
  • Parcels mapped22,148 checked 15 October 2026
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Updated

GrandClear CreekLakeEaglePark Breckenridge Census outline · seat marked

Where it is

Summit on the map of Colorado

Colorado has 64 counties and county equivalents, each with its own records office. Shapes with a page are links.

Adams CountyAlamosa CountyArapahoe CountyArchuleta CountyBaca CountyBent CountyBoulder CountyBroomfield CountyChaffee CountyCheyenne CountyClear Creek CountyConejos CountyCostilla CountyCrowley CountyCuster CountyDelta CountyDenver CountyDolores CountyDouglas CountyEagle CountyElbert CountyEl Paso CountyFremont CountyGarfield CountyGilpin CountyGrand CountyGunnison CountyHinsdale CountyHuerfano CountyJackson CountyJefferson CountyKiowa CountyKit Carson CountyLake CountyLa Plata CountyLarimer CountyLas Animas CountyLincoln CountyLogan CountyMesa CountyMineral CountyMoffat CountyMontezuma CountyMontrose CountyMorgan CountyOtero CountyOuray CountyPark CountyPhillips CountyPitkin CountyProwers CountyPueblo CountyRio Blanco CountyRio Grande CountyRoutt CountySaguache CountySan Juan CountySan Miguel CountySedgwick CountyTeller CountyWashington CountyWeld CountyYuma CountySummit County Summit
Counties of Colorado · Summit highlighted

History

Formed in 1861 from Larimer County

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

Summit County was created in 1861 by Colorado Territory from Larimer County. Its eastern boundary with Larimer County, marked by the "summit of the Snowy Range," was disputed until 1886, when the Colorado Supreme Court ruled that the boundary followed the Continental Divide. The county lost territory to the creation of Grand County in 1874, Garfield County in 1883, and Eagle County in 1883, while gaining small areas from Lake County in 1879.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1861
    Summit County created Summit created by Colorado Territory from non-county area. Summit's eastern boundary with Larimer (described as the "summit of the Snowy Range") was open to different interpretations. In 1886, the Colorado Supreme Court ruled that the "snowy range" referred to the Continental Divide, and the Summit boundary is mapped in accordance with that court ruling.
    from Larimer
    · Colo. Terr. Laws 1861, 1st sess., secs. 20, 34/pp. 55, 57; "Grand County v. Larimer County," in Colo. Rpts., 9:268-281; "Summit County v. Lake County," in Colo. Rpts., 70: 417-423
  2. 1874
    Lost territory Summit lost to creation of Grand.
    to Grand
    · Colo. Terr. Laws 1874, 10th sess., pp. 70-71; "Grand County v. Larimer County," in Colo. Rpts., 9:268-281; Royce, 848-849, pl. cxvi
  3. 1879
    Gained territory Summit gained small areas from Lake, lost small areas to creation of Carbonate (extinct) along the Continental Divide.
    from Lakefrom Carbonate
    · Colo. Laws 1879, 2d sess., pp. 45-47
  4. 1883
    Lost territory Summit lost to creation of Garfield.
    to Garfield
    · Colo. Laws 1883, 4th sess., pp. 130-133
  5. 1883
    Lost territory Summit lost to creation of Eagle.
    to Eagle
    · Colo. Laws 1883, 4th sess., pp. 127-130

Land and parcels

What the maps cover in Summit

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

Summit by the Census

Population
31,055 2020 Census count
Housing units
31,342 2020 Census count
Land area
608 square miles
Water area
11 square miles
People per sq mi
51 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

Who to ask before you build, dig or sell

Official county pages only. We link to them; we do not copy them, because they change.

Inside a city or town, permits usually come from that city rather than the county.

Permits

Zoning and code

County government

See your own lot on these maps

Open Summit 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 Summit County

When was Summit County founded?
Summit County was founded in 1861, formed from Larimer County, and named after Continental Divide of the Americas.
What is the county seat of Summit County?
The county seat of Summit County is Breckenridge.
Is there an online parcel map for Summit County?
Yes. A public source publishes a parcel map of 22,148 parcels, rated fallback here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Summit County's boundary or name changed?
Summit County was created in 1861 from Larimer County. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Carbonate County, Eagle County and Garfield County.
Who issues building permits in Summit County?
The county's page on building permits: Licenses & Permits. Inside a city or town, ask that city first.
Is my lot in a flood zone?
We do not have flood maps for Summit 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