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zipcodes.pro — ZIP/98611

98611

ZIP 98611 is Castle Rock, Washington, in Cowlitz County; area codes 360 and 564; Pacific time.

Type
Standard
Time zone
America/Los_Angeles
County
Cowlitz
Metro area
Longview-Kelso, WA
Population
9,302
Coordinates
46.3051, -122.9007
☼ Live from 98611 — Castle Rock, WA

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Where 98611 is

Approximate ZIP boundary (Census ZCTA 2020). ZIP codes are mail routes, not areas, so the shape shown is the Census tabulation area that approximates it.

★ Weird and wonderful facts about 98611
  • 🔢 Type 98611 into a pocket calculator and turn it upside down: IIgBG — not quite a word, sorry.
  • ➕ As a number, 98,611 = 31 × 3181. Its digits add up to 25, a total 2,242 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 11000000100110011
  • 🏠 Its numerical neighbours: 98610 (Carson, WA, 56 mi away) and 98612 (Cathlamet, WA, 19 mi away).
  • 🔄 Backwards, 98611 becomes 11689, which is not a ZIP code at all.
  • 👥 11 other ZIP codes are made of exactly the same digits (11968, 18619, 18916, 68119, 89116, 89161, …). The farthest-flung twin is 96811 in Honolulu, HI, 2,609 miles away.
  • 🧭 Farther north than 94% of all ZIP codes, and farther west than 98%.
  • 🎯1,300 miles northwest of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 98611 and you would come out at 46.31°S, 57.10°E — 643 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 48m of daylight. Shortest: 8h 36m.
  • 📏 At 136.1 square miles of land, 98611 is bigger than 85% of ZIP codes — room for about 103 Central Parks.
🌙 The sky over 98611 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population9,302This ZIP9,302
Households3,539This ZIP3,539
Housing units3,723This ZIP3,723
Median age43.7This ZIP43.7Washington38.3US 38.9
Median household income$86,322This ZIP$86,322Washington$98,141US $80,734
Median home value$425,700This ZIP$425,700Washington$564,600US $332,700
Median gross rent$1,250This ZIP$1,250Washington$1,760US $1,413
Bachelor's degree or higher14.9%This ZIP14.9%
Mean commute29.2 minThis ZIP29.2 min
Population density68.3 / sq miThis ZIP68.3 / sq mi

Business and tax activity

Business establishments160This ZIP160
Employees902This ZIP902
Annual payroll$38,709,000This ZIP$38,709,000
Tax returns filed5,050This ZIP5,050
Total adjusted gross income$395,996,000This ZIP$395,996,000

Land area

Land area136.13 sq miThis ZIP136.13 sq mi
Water area1.47 sq miThis ZIP1.47 sq mi

Other place names in 98611

Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.

ZIP codes near 98611

ZIPCityDistance
98645 Silverlake, WA 7.0 mi
98593 Vader, WA 8.5 mi
98581 Ryderwood, WA 8.8 mi
98632 Longview, WA 10.4 mi
98626 Kelso, WA 11.0 mi
98591 Toledo, WA 12.0 mi
98596 Winlock, WA 13.2 mi
98609 Carrolls, WA 16.2 mi
98538 Curtis, WA 17.0 mi
98649 Toutle, WA 17.6 mi

Find every ZIP code within 10 miles of 98611 →

Questions about this ZIP code

Where is ZIP code 98611?

98611 is in Castle Rock, Washington, in Cowlitz County, part of the Longview-Kelso, WA metropolitan area. Its published point location is 46.3051, -122.9007.

What county is 98611 in?

98611 lies in Cowlitz County.

What area code is 98611?

Castle Rock uses area codes 360 and 564, from NANPA's telephone records.

What time zone is 98611 in?

98611 uses America/Los_Angeles.

How many people live in 98611?

About 9,302 people live in ZIP code 98611, in 3,539 households, at 68.3 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.

What is the median household income in 98611?

$86,322 a year, against $98,141 across Washington.

What ZIP codes are near 98611?

The closest are 98645 (7 mi), 98593 (8.5 mi), 98581 (8.8 mi), 98632 (10.4 mi) and 98626 (11 mi).

Is 98611 a PO Box ZIP code?

98611 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “98611 ZIP Code — Castle Rock, Washington (Cowlitz County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/98611

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