77470 ZIP Code — Rock Island, TX

Colorado County, Texas

ZIP code 77470 is located in Rock Island, Texas, within Colorado County. It covers approximately 28.54 square miles and serves a population of 404 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 979.

About ZIP code 77470

The housing stock consists of predominantly single-family detached homes. Most homes were built in the pre-1940, giving the area an established character. Median home value is $149,200. Owner-occupancy is high at 90%, well above the national average.

Median household income is $48,478. 37% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is sales and office, with retail trade as the leading industry. An above-average commute of 70 minutes suggests many residents work outside the immediate area.

College attainment at 9% is below the national average, consistent with a trades and production-oriented local economy.

Health indicators show elevated rates of diabetes (16%), smoking (24%) compared to national benchmarks.

Overall, ZIP code 77470 reflects a community defined by a trades-oriented workforce, high homeownership, and a significant Social Security-dependent population.

404

population

28.54

sq mi land

Standard

ZIP type

Central (CT)

timezone

77470 ZIP code map

Cities in ZIP code 77470

Below are the cities the US Postal Service accepts for ZIP code 77470. Using any city not on this list may result in mail delivery delays.

City	Status
Rock Island	Acceptable

Demographics updated 06/2026

Population
Total population	404
Population density	14 / sq mi
State FIPS	48
County FIPS	089

Geography
Land area	28.54 sq mi
Water area	0.37 sq mi
Latitude	29.4745
Longitude	-96.5797
Timezone	Central (CT)
Area code	979

Total population by age

Gender

Race & ethnicity

Economics updated 06/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	58.2%	45.4%	39.5%
$50k – $100k	39.7%	30.1%	30.1%
$100k – $200k	2.2%	20.4%	22.6%
Over $200k	0.0%	4.1%	7.8%

Demographics & statistics

404

Population

People per sq mi

41.8

Median age

$48,478

Median household income

$19,433

Per capita income

$149,200

Median home value

Median monthly rent

89.5%

Home ownership

11.9%

Poverty rate

26.4%

Unemployment

280

Housing units

9.1%

Bachelor's or higher

Age distribution

Male Female

Under 5

10–14

15–19

20–24

25–34

35–44

45–54

60–64

65–74

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	96	23.8%
18 and over	308	76.2%
65 and over	72	17.8%
Median age	41.8 years

Race & ethnicity

White 94.6%

Black or African American 2.4%

Hispanic or Latino 1.5%

Two or more races 1.5%

Group	Count	%
White	388	94.6%
Black or African American	10	2.4%
Hispanic or Latino	6	1.5%
Two or more races	6	1.5%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	58.2%	45.4%	39.5%
$50k – $100k	39.7%	30.1%	30.1%
$100k – $200k	2.2%	20.4%	22.6%
Over $200k	0.0%	4.1%	7.8%

Under $10k 9.3%

$10k–$15k 8.1%

$15k–$25k 3.5%

$25k–$35k 12.2%

$35k–$50k 33.1%

$50k–$75k 31.4%

$100k–$150k 2.3%

Range	% of households
Under $10k	9.3%
$10k–$15k	8.1%
$15k–$25k	3.5%
$25k–$35k	12.2%
$35k–$50k	33.1%
$50k–$75k	31.4%
$100k–$150k	2.3%
Median income	$48,478

Housing

Home values

Under $50k 2.6%

$50k–$100k 27.9%

$100k–$150k 20.1%

$150k–$200k 9.1%

$200k–$300k 5.2%

$300k–$500k 29.9%

$500k–$1M 5.2%

Housing overview

Metric	Value
Median home value	$149,200
Median rent / month	$0
Owner occupied	89.5%
Renter occupied	10.5%
Vacant	42.3%
Single-family detached	78.2%
Large apartment buildings	0.0%
Mobile homes	21.8%
Median rooms	4.4
Avg household size (owned)	2.37

Year built

Era	%
2020 or later	4.7%
2010–2019	6.0%
2000–2009	0.0%
1990–1999	7.0%
1980–1989	9.4%
1970–1979	3.7%
1960–1969	14.1%
1950–1959	14.1%
1940–1949	2.0%
1939 or earlier	38.9%

Bedrooms

Size	% of units
No bedroom (studio)	2.3%
1 bedroom	5.0%
2 bedrooms	28.9%
3 bedrooms	59.4%
4 bedrooms	4.4%
5+ bedrooms	0.0%

Vehicles per household

Vehicles	% of households
No vehicle	0.0%
1 vehicle	21.5%
2 vehicles	44.2%
3 or more	34.3%

Heating fuel

Fuel type	%
Utility gas	4.7%
Electricity	77.9%
Propane / LP gas	17.4%

Households & families

Household type	Count	%
Married-couple family	106	61.6%
Cohabiting couple	0	0.0%
Male householder, no spouse	14	8.1%
Female householder, no spouse	52	30.2%
Households with children under 18	77	44.8%
Households with seniors (65+)	53	30.8%
Average household size	2.35

Marital status

Status	Male	Female
Never married	25.9%	22.8%
Married	58.9%	61.8%
Separated	0.0%	0.0%
Widowed	0.0%	15.4%
Divorced	15.1%	0.0%

Education

Less than 9th grade 5.1%

Some HS, no diploma 16.8%

HS graduate 29.2%

Some college, no degree 33.2%

Associate's degree 6.6%

Bachelor's degree 2.6%

Graduate / professional 6.6%

Metric	%
HS diploma or higher	78.1%
Bachelor's or higher	9.1%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	0	0.0%
Kindergarten	0	0.0%
Elementary school	0	0.0%
High school	70	75.3%
College / grad school	23	24.7%

Employment

Industry of employment

Retail trade 35.2%

Manufacturing 25.4%

Education & healthcare 19.0%

Public administration 7.7%

Agriculture & mining 4.9%

Wholesale trade 4.9%

Arts, food & hospitality 2.8%

Occupation

Category	%
Management, business & arts	7.7%
Service	19.0%
Sales & office	52.8%
Natural resources & construction	4.9%
Production & transportation	15.5%

Employment type

Type	%
Private sector	76.1%
Government	23.9%
Self-employed	0.0%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	100.0%
Carpool	0.0%
Public transit	0.0%
Walk	0.0%
Work from home	0.0%
Other means	0.0%
Avg commute (minutes)	70.3

Poverty

All people 11.9%

Under 18 years 18.8%

18 and over 9.7%

Married-couple families 0.0%

Female-led households 45.7%

Income support

Source	% of households
Social Security	37.2%
Retirement income	39.0%
Supplemental Security	0.0%
Cash public assistance	0.0%
Food stamps / SNAP	2.3%

Health indicators

Condition	%
Obesity	41.0%
High blood pressure	41.9%
High cholesterol	39.6%
Diabetes	16.0%
Heart disease	9.7%
Stroke	4.6%
Asthma	9.9%
Arthritis	30.0%
Kidney disease	4.1%
Pulmonary disease	10.7%
Cancer	7.4%

Behavior / access	%
Smoking	23.5%
Binge drinking	16.5%
No physical activity	31.8%
Less than 7 hrs sleep	34.8%
Depression	23.6%
Fair or poor health	24.0%
Poor mental health	16.5%
Poor physical health	15.5%
No health insurance	27.7%
Visited doctor (checkup)	72.5%
Visited dentist	47.2%
Cholesterol screening	88.4%
Teeth loss	20.4%

Veterans & disability

Veterans	Count	%
Civilian veterans	21	6.8%

Disability	%
Any disability	17.8%
Under 18	13.5%
18–64 years	10.2%
65 and over	48.6%

Health insurance coverage

Type	%
Private insurance	73.3%
Public insurance	40.8%
No insurance	8.4%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	378	93.6%
Spanish	0	0.0%
Other Indo-European	0	0.0%
Asian & Pacific Islander	0	0.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	382	94.6%
Born in same state	382	94.6%
Born in different state	310	76.7%
Foreign born	0	0.0%
Naturalized citizen	22	5.4%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
Italian	109	27%
French	29	7.2%

Ancestry	Count	%
Arab	7	1.7%

Technology access

Metric	% of households
Computer access	42.6%
Internet access	92.4%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions about ZIP code 77470

What city is ZIP code 77470 in?

ZIP code 77470 is primarily assigned to Rock Island, Texas.

What county is ZIP code 77470 in?

ZIP code 77470 falls within Colorado County, Texas.

Is ZIP code 77470 mostly owner-occupied?

90% of occupied units in ZIP code 77470 are owner-occupied, well above the national average.

How educated is the population of ZIP code 77470?

9% of residents hold a bachelor's degree or higher — below the national average of ~33%, consistent with a trades-oriented local economy.

Does ZIP code 77470 have a large retiree population?

37% of households in ZIP code 77470 receive Social Security income, suggesting a significant retiree or disability population.

What is the typical home value in ZIP code 77470?

The median home value in ZIP code 77470 is $149,200.

What timezone is ZIP code 77470 in?

ZIP code 77470 observes the CST timezone.