Lake Cassidy is a community in Snohomish County, Washington, home to about 3,292 people across 11 square miles. It has no ZIP code of its own: it’s part of 98258 and 98270.
Homes sold for a median of $368 per square foot across 2 ZIP codes in the three months ending August 2026, and all of them were seller’s markets.
Mostly Lake Stevens; part is in Lake Cassidy
Mostly Marysville; part is in Lake Cassidy
Each card is that ZIP code’s whole market, including any part outside Lake Cassidy. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Lake Cassidy’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Seattle–Tacoma International Airport (SEA)41 miles away |
|---|---|
| Closer regional airport | Arlington Municipal Airport10 miles away |
| Nearest city of 250,000+ | Seattle, WA31 miles away |
Straight-line distances from the center of Lake Cassidy; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Lake Cassidy had 3,757 residents in the 2020 census, up 10% since 2010.
It’s the 246th largest of 628 towns in Washington by population.
Snohomish County grew from 23,950 residents in 1900 to 827,957 in 2020.
Snohomish County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 76°F in summer, and winter lows average 34°F. About 40.2 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Everett, WA weather station (6 miles away).
283,649 jobs at 20,258 businesses in Snohomish County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
494 doctors and other health care providers list an office in Lake Cassidy’s ZIP codes.
Nearest hospitals
Providers with an office here
| Primary care doctors | 62 |
|---|---|
| Specialist doctors | 3 |
| Dentists | 65 |
| Nurse practitioners and physician assistants | 47 |
| Mental health providers | 161 |
| Physical and occupational therapists | 112 |
| Optometrists | 14 |
| Chiropractors | 30 |
| Pharmacies | 26 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (30 nearby)
Grocery stores (4 nearby)
Pharmacies (2 nearby)
Libraries (1 nearby)
Museums (1 nearby)
Theaters and performance venues
Counts are within about 2.5 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Marysville School District, Lake Stevens School District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Allen Creek Elementary SchoolMarysville | Pre-K–5 | 437 | Public | 3.9 mi |
| Early Learning CenterLake Stevens | Pre-K | 259 | Public | 1.4 mi |
| Highland ElementaryLake Stevens | Pre-K–5 | 557 | Public | 0.2 mi |
| Hillcrest Elementary SchoolLake Stevens | Pre-K–5 | 842 | Public | 2.4 mi |
| Kellogg Marsh Elementary SchoolMarysville | Pre-K–5 | 468 | Public | 4.8 mi |
| Liberty ElementaryMarysville | Pre-K–5 | 398 | Public | 4.8 mi |
| Marysville SD SpecialMarysville | Pre-K–12 | 197 | Special Education | 5.4 mi |
| Skyline ElementaryLake Stevens | Pre-K–5 | 562 | Public | 2.8 mi |
| Sunnycrest Elementary SchoolLake Stevens | Pre-K–5 | 695 | Public | 0.9 mi |
| Cascade ElementaryMarysville | K–5 | 382 | Public | 5.7 mi |
| Glenwood ElementaryLake Stevens | K–5 | 641 | Public | 3.3 mi |
| Grove ElementaryMarysville | K–5 | 392 | Public | 4.1 mi |
| HomelinkLake Stevens | K–12 | 31 | Alternative Education | 0.1 mi |
| Mt. Pilchuck Elementary SchoolLake Stevens | K–5 | 554 | Public | 1.1 mi |
| Pinewood ElementaryMarysville | K–5 | 398 | Public | 5.1 mi |
| Stevens Creek ElementaryLake Stevens | K–5 | 701 | Public | 1.3 mi |
| Sunnyside ElementaryMarysville | K–5 | 452 | Public | 3.1 mi |
| Cedarcrest SchoolMarysville | 6–8 | 704 | Public | 4.6 mi |
| Lake Stevens Middle SchoolLake Stevens | 6–7 | 709 | Public | 2.9 mi |
| Marysville Middle SchoolMarysville | 6–8 | 656 | Public | 4.7 mi |
| North Lake Middle SchoolLake Stevens | 6–7 | 856 | Public | 0.7 mi |
| Totem Middle SchoolMarysville | 6–8 | 522 | Public | 5.0 mi |
| Cavelero Mid High SchoolLake Stevens | 8–9 | 1,490 | Public | 4.0 mi |
| Outcomes for Academic ResilienceLake Stevens | 8–12 | — | Alternative Education | 0.7 mi |
| LSSD Open DoorsLake Stevens | 9–12 | 15 | Alternative Education | 0.8 mi |
| Marysville Getchell High SchoolMarysville | 9–12 | 1,381 | Public | 4.0 mi |
| Prove High SchoolLake Stevens | 9–12 | — | Alternative Education | 0.8 mi |
| Lake Stevens Sr High SchoolLake Stevens | 10–12 | 2,205 | Public | 0.1 mi |
| Marysville NWESD 189 Youth EngagementMarysville | 10–12 | 205 | Alternative Education | 5.0 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Bethlehem Christian SchoolMarysville | Pre-K–K | 20 | Evangelical Lutheran Church in America | 4.7 mi |
| Zion Lutheran SchoolLake Stevens | Pre-K–8 | 257 | Lutheran Church–Missouri Synod | 4.4 mi |
| Academy NorthwestMarysville | K–12 | 285 | Christian (no specific denomination) | 5.0 mi |
| Evangel Classical SchoolMarysville | K–12 | 185 | Christian (no specific denomination) | 5.7 mi |
| Grace AcademyMarysville | K–12 | 408 | Other religious | 4.4 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Marysville, Lake Stevens, Lochsloy, Bunk Foss, Cavalero and Machias.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.