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How do tree services in Washington get more customers from Google and AI search?

Facts checked November 8, 2026 by Ansh Singh

Short answer: Tree Services in Washington get found online with a website that shows their license number, names the towns they serve such as Seattle, Spokane and Tacoma, and collects real local reviews. Licensing runs through the Washington State Department of Labor & Industries (L&I). The state had 3,206 businesses with staff in this Census category in 2022.

Do tree services need a license in Washington?

In Washington, the licensing body for this work is Washington State Department of Labor & Industries (L&I).

License or registration types named by the state: Contractor registration (tree removal specialty).

• No state arborist license found. Pesticide license for tree spraying: unknown.

Homeowners can check a license on the state lookup page. Put your number where they will look for it.

Contractor registration in Washington sits with Washington State Department of Labor & Industries (L&I). All construction contractors must register with L&I before they bid, advertise or work. Bond is $30,000 for general and $15,000 for specialty. Liability insurance is $200,000 public plus $50,000 property damage, or $250,000 combined.

License numbers in ads and on websites

Contractors must include their L&I registration number in advertising, bids, estimates, business cards and online ads. Using a false or expired registration number to buy a required ad is a gross misdemeanor (RCW 18.27.020).

What does a year of tree service work look like in Washington?

Publish each seasonal page four to six weeks ahead.

Temperatures: NOAA NCEI nClimDiv statewide data. Job column: our planning suggestion, not survey data.

How many tree service companies compete in Washington’s main cities?

Competition is tightest around Spokane (Spokane County), with one business for every 2,377 residents, and loosest around Tacoma, at one per 3,005.

Source: US Census Bureau, County Business Patterns 2022 and County Population Estimates 2023. Counts businesses with paid employees only.

How many tree service companies are in Washington?

The Census Bureau counted 3,206 businesses with employees in Washington in 2022, in the category “Landscaping services (the Census group that includes tree services)”. That ranks Washington 13th of 50 states, a mid-sized market, and 3% of the US total. 85% of them have fewer than 10 staff, and 201 have 20 or more.

Together they employ 18,870 people, with an average yearly payroll of $297,529 per business. The three busiest counties hold 50% of them, so the work is spread across the state.

With 7,812,880 residents (Census, July 2023), that is one business for every 2,437 people, against 2,855 nationally: fewer residents per business than the US average, so more competition for each job.

Washington next to its neighbors

Counties with the most tree service companies

32 of Washington’s counties have at least one. Source: US Census Bureau, County Business Patterns 2022.

How big are they?

Businesses by number of employees, 2022: 2,226 with 1-4 staff, 514 with 5-9 staff, 264 with 10-19 staff, 159 with 20-49 staff, 42 with 50+ staff.

Where Washington is growing

New homes and new owners bring new work. Washington's population changed +1.1% from July 2020 to July 2023. The fastest-growing counties with 50,000 or more people:

• Lewis County: 86,154 people, +4.4% since 2020, 23 tree service companies
• Benton County: 215,219 people, +3.8% since 2020, 82 tree service companies
• Mason County: 68,389 people, +3.6% since 2020, 30 tree service companies
• Grant County: 102,678 people, +3.3% since 2020, 27 tree service companies
• Clark County: 521,150 people, +3.1% since 2020, 187 tree service companies

Source: US Census Bureau, County Population Estimates, Vintage 2023.

What should a Washington tree service website show?

• Your license number in the footer of every page. Washington requires it in advertising for at least some trades.
• A service area list that names real counties and towns, for example King County, Snohomish County and Pierce County.
• Seasonal pages published before May, so they are found when demand starts.
• Real reviews from local jobs, with the town named, and photos of your own work.

Washington questions

Who licenses tree services in Washington?

Washington State Department of Labor & Industries (L&I). No state arborist license found. Pesticide license for tree spraying: unknown.

How many tree service companies are there in Washington?

The US Census Bureau counted 3,206 businesses with employees in Washington in 2022 in the category Landscaping services (the Census group that includes tree services), and 85% of them have fewer than 10 staff.

Which county in Washington has the most tree service companies?

King County, with 828 businesses with employees in 2022 (Census County Business Patterns).

Do I need my license number on my website in Washington?

Contractors must include their L&I registration number in advertising, bids, estimates, business cards and online ads. Using a false or expired registration number to buy a required ad is a gross misdemeanor (RCW 18.27.020).

When is the busiest season for tree services in Washington?

Washington’s statewide average runs from about 31°F in December to about 65°F in July (NOAA, 1991 to 2020).

Sources

• US Census Bureau, County Business Patterns 2022 (state and county files)
• US Census Bureau, City, Town and County Population Estimates, Vintage 2023
• NOAA NCEI, nClimDiv statewide temperature and degree days, 1991 to 2020
• https://lni.wa.gov/licensing-permits/contractors/
• https://lni.wa.gov/licensing-permits/contractors/register-as-a-contractor/
• https://app.leg.wa.gov/rcw/default.aspx?cite=18.27.020