🇺🇸 United States ZIP Code

STANDARD

77861

Iola

ZIP Code 77861 is a standard zip code serving Iola, Iola, Texas (TX), in Grimes County, United States. It has an estimated population of 2,506 with a median household income of $66,397. The area falls within the America/Chicago timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Texas (TX)
County: Grimes
City: Iola
Timezone: America/Chicago

Coordinates

Latitude: 30.732600
Longitude: -96.091100

Geographic Details

Land Area: 127.33 mi²
Water Area: 3.82 mi²
Population Density: 20.0 people per mi² (20th percentile)
Bounding Box: 30.842661°N, 30.603417°S, -96.000973°E, -96.183641°W

With 2,506 residents spread across 127.33 square miles, this area has a population density of 20.0 people per square mile.

Demographics

2,506

Population

45th percentile

$66,397

Median Income

80th percentile

$109,800

Median Home Value

40th percentile

127.33 mi²

Land Area

The median household income in 77861 is $66,397, and the median home value is $109,800. This places the area in the top 25% nationally for household income.

Housing

1,186

Total Units

938

Occupied Units

79.1%

Occupancy Rate

Similar ZIP Codes in Texas

ZIP codes with similar median household income in Texas.

79606

Abilene

$56,844

77077

Houston

$59,958

78750

Austin

$76,236

77068

Houston

$67,945

78731

Austin

$75,269

76310

Wichita Falls

$63,646

77571

La Porte

$68,102

75075

Plano

$72,852

Frequently Asked Questions

What information is available for each ZIP code?

Each ZIP code page shows city, state, county, geographic coordinates, timezone, population, median household income, median home value, housing units, land area, population density, commute time, educational attainment, area codes, and ZIP code type (Standard, PO Box, or Unique).

What are the different types of ZIP codes?

There are three types of ZIP codes: Standard (residential and commercial delivery areas), PO Box (assigned to post office box sections), and Unique (assigned to a single high-volume address like a government agency or large company). Standard ZIP codes are the most common.

How often is ZIP code data updated?

ZIP code assignments are updated quarterly by the USPS. Demographic data comes from the US Census Bureau's American Community Survey (ACS), which releases new 5-year estimates annually. ZipFYI updates its data to reflect the latest available information.

What is population density and why does it matter?

Population density measures the number of people per square mile in a ZIP code area. It helps identify urban vs. rural areas, affects real estate values, impacts service availability, and is used in market analysis. Dense urban ZIP codes may have 50,000+ people per square mile.

How are ZIP code boundaries determined?

ZIP code boundaries are determined by the USPS based on mail delivery routes, not political or geographic boundaries. They follow carrier routes and may cross city, county, or even state lines. Boundaries can change when the USPS reorganizes delivery operations.

What does median household income tell me about a ZIP code?

Median household income is the middle value when all household incomes in a ZIP code are sorted. Half of households earn more and half earn less. It is a better indicator of typical earnings than average income, which can be skewed by very high or very low outliers.