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Costilla County

Colorado · Public K-12

Public-school enrollment in Costilla County clocks in around 493 students across 2 schools.

7-year change in Costilla County

SY 2017-18 vs SY 2024-25
Total enrollment
493
-5 (-1%) vs SY 2017-18
School count
2
0 (0%) vs SY 2017-18
% White
16%
was 14%
% Hispanic
80%
was 84%
% Black
1%
was 1%
Source: NCES Common Core of Data, enrollment-weighted demographic averages
Schools
2
2 districts
Enrollment
493
NCES CCD
Median income
$36,861
Below Colorado avg
Free/reduced lunch
83.8%
Above Colorado avg
Elementary
0
schools
Middle
0
schools
High
0
schools
Combined / other
2
493 students
LARGEST DISTRICT
Sierra Grande School District No. R-30
307 students · 2 districts in Costilla County

County vs. school enrollment demographics

Left bar is the racial makeup of Costilla County residents (Census ACS 5-year). Right bar is the enrollment-weighted makeup of public schools in the county (NCES CCD). NCES systematically under-reports Hispanic, Pacific Islander, and Native American enrollment for many schools; where the resident share is meaningful but the reported school share is zero, we mark the school bar "not reported".

County residents
White
44%
Hispanic
55%
Black
3%
Asian
2%
Two or more
39%
Native American
5%
Pacific Islander
0%
School enrollment
White
16%
Hispanic
80%
Black
1%
Asian
0%
Two or more
2%
Native American
n/r
Pacific Islander
0%
Bachelor's+
24.9%
adults 25+
Poverty rate
19.7%
ACS 5-year
Unemployment
3.5%
civilian labor
Median age
51
18.6% under 18

Test scores in Costilla County

Latest 2024-25 ELA proficiency, 2 schools ranked. Colorado state average: 44.9%.

Top 2 schools (ELA)
  1. Sierra Grande K-12 School· 24.4%
  2. Centennial School· 16.4%

See all 2 schools in Costilla County ranked by score →

All schools (2)

LargestA-ZTop rated
NameCityLevelGradesEnrollmentRating
Sierra Grande K-12 SchoolBlancaCombinedPK-12307·
Centennial SchoolSan LuisCombinedPK-12186·

Cities in Costilla County

Blanca1 schoolSan Luis1 school

About Costilla County

Costilla County is a compact Colorado county of about 3,607 residents, home to 2 public schools and roughly 493 students.

Stepping back, census numbers show median household income runs near $36,861, about 25% of adults have a bachelor's degree or above, and the federal-poverty share is near 20%. That income level is 52% meaningfully below the Colorado median.

Sierra Grande School District No. R-30 dominates the local landscape, accounting for roughly 307 students on its own.

Looking at the last 7 years. Combined enrollment now sits at 493 students, remained close to its prior level from the 498 reported in SY 2017-18. Demographically, the Hispanic share of enrollment fell from 84% to 80%.

On allk12, the community for Costilla County discusses open enrollment windows, redistricting talk, and busing logistics. Posts come from current and former families, staff, and alumni.

Frequently asked questions

How many public schools are in Costilla County?
Costilla County, Colorado has 2 public K-12 schools serving approximately 493 students.
What is the largest school district in Costilla County?
Sierra Grande School District No. R-30 is the largest school district in Costilla County, serving approximately 307 students. The county contains 2 school districts overall.
What is the population of Costilla County?
Costilla County, Colorado has a population of approximately 3,607, with a median age of 51. About 18.6% of residents are under 18.
What is the median household income in Costilla County?
Median household income in Costilla County is $36,861, below the Colorado average of $77,440. About 19.7% of residents live below the federal poverty line.
How educated are residents of Costilla County?
Approximately 24.9% of adults 25 and older in Costilla County hold a bachelor's degree or higher, according to the Census ACS 5-year estimate.
What share of students in Costilla County qualify for free or reduced lunch?
Roughly 83.8% of students in Costilla County public schools qualify for free or reduced-price lunch, a common proxy for low-income enrollment. This is higher than the Colorado county average of 50.3%.
What is the student-teacher ratio in Costilla County schools?
Across Costilla County public schools, the enrollment-weighted student-teacher ratio is approximately 18.1 to 1.
What is the racial makeup of Costilla County?
Costilla County residents are approximately 44% White, 55% Hispanic, 3% Black, 2% Asian, 39% two or more races according to the Census ACS 5-year estimate.
What share of housing in Costilla County is owner-occupied?
Costilla County has about 2,433 housing units, of which roughly 79.0% are owner-occupied.
What are the largest public schools in Costilla County?
By enrollment, the largest public schools in Costilla County include Sierra Grande K-12 School, Centennial School. Enrollment figures come from the latest NCES Common Core of Data.
DATA · Census ACS 5-year · NCES Common Core of Data