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WA · for parents

Autism in Washington

You are not alone. Here is what is true about the child population and public systems in Washington — and where to start with early intervention, school, and coverage.

The short answer for Washington

  • You are not alone in Washington: Census counts 1,648,066 children ages 0–17 (Vintage 2023).
  • IDEA Part B (SY 2022–23): 20,102 children ages 3–21 reported under the Autism disability category in special education (OSEP Section 618) — a served count, not a full population census.
  • Under 3: Early Support for Infants and Toddlers (ESIT). School age: written evaluation request to the district; statewide info via OSPI Washington — Special Education.
  • Coverage: Apple Health (Washington Medicaid). Rights: Disability Rights Washington.
  • Published access checklist: 100% (stronger published access path). City numbers only appear later with true local sources.

You are not alone in Washington

Families across Washington are navigating evaluation, school plans, and services. The figures below are from primary public sources — Census population and IDEA special-education child counts — not invented totals.

  • 1,648,066 children ages 0–17 live in Washington (U.S. Census Bureau, Vintage 2023 civilian estimates). You share this state with a large generation of families raising kids.
  • In school year 2022–23, Washington reported 20,102 children ages 3–21 receiving special education under the Autism disability category (U.S. Department of Education, IDEA Section 618). That is a real administrative count of children served under that category — still not every autistic child in the state, but clear proof many families are on a related path.
  • Public systems exist because this is not rare here: Early Support for Infants and Toddlers (ESIT), school special education, Apple Health (Washington Medicaid), and Disability Rights Washington.

Key numbers for autism families in Washington

Children ages 0–17 in Washington1,648,066Families share this state with a large generation of kidsU.S. Census · Vintage 2023Source [1]
In special education under “Autism” (ages 3–21)20,102Served under IDEA Part B Autism category — not every autistic childIDEA §618 Part B · SY 2022-23Source [2]
Share of special education (Part B)13.2%Of all Part B disabilities ages 3–21 in the same reportIDEA §618 Part B · SY 2022-23Source [2]
How common identification is (national)1 in 31CDC monitoring sites · context only, not a Washington censusCDC ADDM · 2022Source [3]
In early intervention (birth–2, all reasons)11,344Part C total served — not autism-onlyIDEA §618 Part C · SY 2022–23Source [10]

Of the IDEA Autism total: 1,439 ages 3–5 and 18,663 school age 5–21.Source [2]

Where to start in Washington

Pick the path that matches your child. Each bullet is one clear action.

  1. If your child is under 3

    Call early intervention

    • WhoEarly Support for Infants and Toddlers (ESIT)
    • Do thisAsk for a developmental evaluation
    • Good to knowYou usually do not need a private autism diagnosis first
    • Phone800-322-2588
    Start a referralProgram homepage
    Source [5]

  2. If your child is 3 or older

    Ask the school for an evaluation

    • WhoYour local school district
    • Do thisSend a written request for a special education evaluation
    • SaveDate the letter and keep a copy
    • Statewide infoOSPI Washington
    Open special education infoHow IEPs work
    Source [6]

  3. For health coverage

    Check Medicaid

    • WhoApple Health (Washington Medicaid)
    • Ask aboutChildren’s coverage
    • Also askEPSDT (screening and treatment for kids on Medicaid)
    • Also askAny developmental disability or HCBS waivers
    • RememberThe agency decides eligibility — not this site
    • ExpansionYes in this catalog[9]— re-check before you rely on it
    Open Medicaid site
    Source [7]

  4. If you are stuck or ignored

    Get free disability rights help

    • WhoDisability Rights Washington
    • WhenSchool or an agency will not act
    • Do thisContact them and put your concerns in writing
    • AlsoKeep copies of emails, letters, and meeting notes
    Contact rights helpIf you disagree with the school
    Source [8]

Programs and rights in Washington

Extra official links from the depth research pass. Only fields with a published source are shown. (Full research template.)

Early intervention

Special education rights

Medicaid, DD services, and waivers

Private insurance mandate

  • Washington statutes (including RCW 48.44.450 and related health plan chapters) require many state-regulated plans to cover diagnosis and treatment of autism spectrum disorder. Confirm current RCW text and plan type.[11]
  • Read statute / official source

Other official help lines

What to do next

If your child is under 3

  1. Refer to Early Support for Infants and Toddlers (ESIT) using the official intake information on this page (source: ECTA Part C directory).
  2. You can usually refer without waiting for a private autism diagnosis.
  3. Ask about evaluation timelines and the written IFSP process.

If your child is preschool- or school-age

  1. Send a written request for a special education evaluation to your school district (keep a copy and note the date).
  2. Use statewide special education information from OSPI Washington — Special Education for parent rights and procedural safeguards.
  3. Ask whether the team is considering IEP or 504 supports and request Prior Written Notice of decisions.

Health coverage and rights

  1. Start with Apple Health (Washington Medicaid) for public coverage pathways; ask about EPSDT and any DD or HCBS waivers.
  2. If access or rights are blocked, contact Disability Rights Washington.
  3. Document everything in writing.

At ages 0–4

toddlers and preschoolers
  • Refer to Early Support for Infants and Toddlers (ESIT) as soon as you have developmental concerns — do not wait for a private diagnosis.
  • Ask your pediatrician for developmental screening and a parallel EI referral the same week.
  • If your child is approaching age 3, ask EI about the transition to school-based services (Part B).

Changes with the age control at the top of the page.

At ages 5–8

5 to 8 year olds
  • Put a special education evaluation request in writing to the school principal or special education director.
  • Use the state special education page for parent rights materials: https://ospi.k12.wa.us/student-success/special-education
  • Ask whether a 504 plan or IEP is under consideration and request Prior Written Notice of decisions.

Changes with the age control at the top of the page.

At ages 9–12

9 to 12 year olds
  • Review the IEP or 504 annually; ask for data on progress, not only compliance with minutes.
  • If the district delays evaluation or services, use state complaint and mediation options via OSPI Washington guidance and Disability Rights Washington.
  • Document home and school differences (sleep, shutdowns, learning) in a short written summary for the team.

Changes with the age control at the top of the page.

At ages 13–16

teenagers
  • Confirm transition planning is in the IEP (federally required by age 16; many states start earlier).
  • Ask Apple Health (Washington Medicaid) about adult-serving waivers or long-term supports planning well before age 18.
  • Involve your teenager in meetings; Disability Rights Washington can help if rights or access are blocked.

Changes with the age control at the top of the page.

Official autism-related contacts in Washington

Early intervention under 3 (Early Support for Infants and Toddlers (ESIT))

Early Support for Infants and Toddlers (ESIT)[5]
Washington DCYF[4]

Also see: Early intervention guide

School and special education

Start with your local school district (written evaluation request). Statewide:

IEP or 504 · IEP disputes

Medicaid

Ask about EPSDT and any developmental disability or HCBS waivers.

Disability rights help

Cities in Washington

Metro guides with local intake contacts, district links, and evaluation pathways:

Autism in Seattle →Local entry points for Seattle families: King County's ESIT early intervention lead agency, Seattle Public Schools' Child Find team, and DSHS's Developmental Disabilities Administration — every fact sourced.17 local resources listedAutism in Spokane →Local entry points for Spokane families: Spokane Regional Health District's ESIT program, Spokane Public Schools' Child Find office, and DSHS's Developmental Disabilities Administration — every fact sourced.10 local resources listedAutism in Tacoma →Local entry points for Tacoma families: Pierce County's ESIT early intervention program, Tacoma Public Schools' two-track Child Find contacts, and DSHS's Developmental Disabilities Administration — every fact sourced.6 local resources listed

Common questions about autism supports in Washington

References

  1. [1]U.S. Census Bureau. Vintage 2023 civilian population by single year of age (SC-EST2023-AGESEX-CIV), ages 0–17 summed for Washington. As of 2023-07-01. Open source
  2. [2]U.S. Department of Education (IDEA §618). Part B Child Count and Educational Environments, school year 2022-23. Children ages 3–21 reported under the Autism disability category (early childhood + school-age totals). This is a count of children served under that category — not a full census of all autistic children. Open source
  3. [3]CDC ADDM Network. Surveillance year 2022: overall ASD prevalence among 8-year-olds across 16 ADDM Network monitoring sites (not every US community) was 32.2 per 1,000 (about 1 in 31). National monitoring-site context only — not a statewide headcount for Washington. Open source
  4. [4]ECTA Center · Part C directory. Part C state systems and coordinators directory (used for Early Support for Infants and Toddlers (ESIT) program and referral fields). Confirm current details on the state site. Open source
  5. [5]Early Support for Infants and Toddlers (ESIT). Washington DCYF. Official early intervention program site for Washington. Open source
  6. [6]OSPI Washington — Special Education. Statewide special education information for Washington. Day-to-day IEPs start with the local school district. Open source
  7. [7]Apple Health (Washington Medicaid). Public Medicaid / health coverage entry point listed for Washington. Eligibility is decided by the agency. Open source
  8. [8]Disability Rights Washington. Protection & Advocacy organization linked for Washington. Open source
  9. [9]Kaiser Family Foundation. Status of State Medicaid Expansion Decisions. Catalog coding for Washington: expanded. Re-check the live tracker before citing. Open source
  10. [10]U.S. Department of Education (IDEA §618 Part C). Total infants and toddlers birth through age 2 receiving Part C early intervention (all eligibility reasons — not autism-only). OSEP Section 618. Open source
  11. [11]State insurance statute / DOI. Washington statutes (including RCW 48.44.450 and related health plan chapters) require many state-regulated plans to cover diagnosis and treatment of autism spectrum disorder. Confirm current RCW text and plan type. Open source

Last checked 2026-08-03. If a link has moved, use the agency’s current homepage.

Last checked 2026-08-03. Programmes and numbers change — always confirm with the agency and your clinician.