Parcel Chartplaces Open the free map

County · code 08023

Costilla CountyColorado

Costilla County is a county in Colorado, with its seat in San Luis. The county was created on November 1, 1861 by Colorado Territory.

  • Founded1861
  • County seatSan Luis
  • Land area1,228 sq mi + 3.4 sq mi water
  • Population3,499 2020 Census
Open the free map Click any parcel in Costilla County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

AlamosaHuerfanoTaos, NMConejosColfax, NMLas Animas San Luis Census outline · seat marked

Where it is

Costilla 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 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 CountySummit CountyTeller CountyWashington CountyWeld CountyYuma CountyCostilla County Costilla
Counties of Colorado · Costilla highlighted

History

Founded in 1861

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

Costilla County was created by Colorado Territory in 1861 from non-county area. Over the following years, the county's boundaries shifted through several adjustments: it lost land to Conejos in 1864 and 1913, to Saguache in 1866 and 1874, to Huerfano in 1868, and to the creation of Rio Grande in 1874, while occasionally gaining small areas from neighboring counties. Conejos was attached to Costilla for judicial purposes in 1865 but fully organized and detached in 1870; similarly, Saguache was attached in 1866 and detached in 1867.

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

  1. 1861
    Costilla County created Costilla created by Colorado Territory from non-county area. · Colo. Terr. Laws 1861, 1st sess., sec. 2/p. 52
  2. 1864
    Lost territory Costilla lost to Conejos.
    to Conejos
    · Colo. Terr. Laws 1864, 3d sess., pp. 68-69
  3. 1865
    Changed Conejos attached to Costilla "for judicial purposes."
    Conejos
    · Colo. Terr. Laws 1865, 4th sess., sec. 18/p. 53
  4. 1866
    Lost territory Costilla lost to creation of Saguache; Saguache not fully organized, attached to Costilla "for judicial purposes."
    to Saguache
    · Colo. Terr. Laws 1866, 6th sess., p. 54
  5. 1874
    Gained territory Costilla gained from Saguache, lost to creation of Rio Grande.
    from Saguachefrom Rio Grande
    · Colo. Terr. Laws 1874, 10th sess., secs. 1, 13/pp. 66, 68
Show all 10 changes (5 more, mostly small adjustments)
  1. 1861
    Costilla County created Costilla created by Colorado Territory from non-county area. · Colo. Terr. Laws 1861, 1st sess., sec. 2/p. 52
  2. 1864
    Lost territory Costilla lost to Conejos.
    to Conejos
    · Colo. Terr. Laws 1864, 3d sess., pp. 68-69
  3. 1865
    Changed Conejos attached to Costilla "for judicial purposes."
    Conejos
    · Colo. Terr. Laws 1865, 4th sess., sec. 18/p. 53
  4. 1866
    Lost territory Costilla lost to creation of Saguache; Saguache not fully organized, attached to Costilla "for judicial purposes."
    to Saguache
    · Colo. Terr. Laws 1866, 6th sess., p. 54
  5. 1867
    Changed Attachment of Saguache to Costilla "for judicial purposes" was confirmed.
    Saguache
    · Colo. Terr. Laws 1866, 6th sess., sec. 8/p. 60
  6. 1867
    Changed Saguache fully organized, detached from Costilla.
    Saguache
    · Hall, 4:304
  7. 1868
    Gained territory Costilla gained small area from Las Animas, lost small area to Huerfano.
    from Las Animasfrom Huerfano
    · Colo. Terr. Laws 1867, 7th sess., ch. 20, p. 164
  8. 1870
    Changed In 1870, Conejos was fully organized, detached from Costilla.
    Conejos
    · HRS Colo., Conejos, 41
  9. 1874
    Gained territory Costilla gained from Saguache, lost to creation of Rio Grande.
    from Saguachefrom Rio Grande
    · Colo. Terr. Laws 1874, 10th sess., secs. 1, 13/pp. 66, 68
  10. 1913
    Lost territory Costilla lost to creation of Alamosa, and lost small area to Conejos.
    to Alamosato Conejos
    · Colo. Laws 1913, 19th sess., ch. 6, pp. 19-24

Land and parcels

What the maps cover in Costilla

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

Costilla by the Census

Population
3,499 2020 Census count
Housing units
2,423 2020 Census count
Land area
1,228 square miles
Water area
3.4 square miles
People per sq mi
3 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

Costilla 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 Costilla 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 Costilla County

When was Costilla County founded?
Costilla County was founded in 1861.
What is the county seat of Costilla County?
The county seat of Costilla County is San Luis.
Is there an online parcel map for Costilla County?
Not that we have found yet. Lot lines and owners of record are kept by the county assessor's office. When a public parcel map appears, it shows here.
Has Costilla County's boundary or name changed?
Costilla County was created in 1861. Since then the Atlas of Historical County Boundaries records 9 later changes, chiefly involving Conejos County, Saguache County and Alamosa County.
Is my lot in a flood zone?
We do not have flood maps for Costilla 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