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ZIP Code Database - Facts & Stats

Data Last Updated: March 1, 2023

Zip Code 78665, Round Rock, TX

ZIP Code 78665 Details

Zip Code:78665
City:Round Rock
State:TX [Texas]
Multi County:No
City Alias(es):Round Rock
Area Code:512 / 737
City Type:P [Post Office]
Classification: [Non-Unique]
Time Zone:Central (GMT -06:00)
Observes Daylight Saving:Yes
Elevation:729 ft
State FIPS:48
County FIPS:491
Division:West South Central
Intro Date:2007-06

ZIP Code 78665 2010 Census Demographics

Current Population:74,106
2010 Population:35,985
Households per ZIP Code:12,056
Average House Value:$324,000
Avg. Income Per Household:$105,407
Persons Per Household:2.98
White Population:26,751
Black Population:4,296
Hispanic Population:8,619
Asian Population:3,238
American Indian Population:413
Hawaiian Population:120
Other Population:2,711
Male Population:17,620
Female Population:18,365
Median Age:31.70 years
Male Median Age:31.30 years
Female Median Age:32.00 years

ZIP Code 78665 Other Demographics

# Residential Mailboxes:24,868
# Business Mailboxes:761
Total Delivery Receptacles:38,137
Number of Businesses:766
1st Quarter Payroll:$152,228,000
Annual Payroll:$638,210,000
# of Employees:11,934
Water Area:0.362 sq mi
Land Area:24.077 sq mi
118th Congressional District:17|31
118th Congressional Land Area:7651.16|2154.49 sq mi
Single Family Delivery Units:467
Multi Family Delivery Units:4,708
# Residential Mailboxes:24,868
# Business Mailboxes:761
Total Delivery Receptacles:38,137

ZIP Code 78665 Social Security Benefits

  2018 2019 Delta
Total Beneficiaries: 5,170 5,755 +585
Retired Workers: 3,520 4,030 +510
Disabled Workers: 625 635 +10
Widow(er)s and Parents: 310 325 +15
Spouses: 225 270 +45
Children: 490 495 +5
65+: 3,785 4,370 +585
Monthly Benefits - All: $7,460,000 $8,553,000 +$1,093,000
Monthly Benefits - Retired Workers: $5,548,000 $6,519,000 +$971,000
Monthly Benefits - Widow(ers): $458,000 $507,000 +$49,000

ZIP Code 78665 Statistical Areas

CBSA: 12420
CBSA Name: Austin-Round Rock-Georgetown, TX
CBSA Type: Metro
CBSA Division: 
CBSA Division Name: 
CBSA Population:1,716,289
CBSA Division Population:0
MSA: 0640
MSA Name: Austin-San Marcos, TX MSA
PMSA Name: 
City State Key:W25448
Preferred Last Line Key:W25448
78664: Previous ZIP Code
Next ZIP Code: 78666


  1. U.S. Postal Service [Last Updated: 3/1/2023],
  2. Internal Data Creation [Last Updated: 3/1/2023],
  3. U.S. Geological Survey [Updated as needed],
  4. U.S. Census [Updated Yearly],
  5. U.S. Census American National Standards Institute (ANSI) [Last Updated: 3/1/2023],
  6. U.S. Census 2010 [Decennial] [Last Updated: 1/1/2010],
  7. Centers for Medicare & Medicaid Services [Updated Yearly],