WA EV Registrations (wa-ev-registrations)

Pull Washington's electric vehicle population - 293,432 registered EVs in WA (one record per vehicle, from the state's free public open data). The source dataset carries a small ~0.3% tail of out-of-state registration rows (relocated vehicles); this tool defaults to WA-only so you always get Washington's fleet.

This answers the EV-adoption questions nobody else packages for Washington: where the EVs are (by county / city), what people drive (make / model mix, Tesla share), what kind (battery vs plug-in hybrid vs hybrid), and how adoption grew (by model year).

Built for AI agents, developers, and market / policy / infrastructure researchers tracking the EV transition in WA state.

What this data is

Each record is one registered EV currently on Washington roads:

Field	Meaning
county / city	Where it's registered
make / model	Vehicle make and model
modelYear	Model year (the adoption-history axis)
evType	Battery Electric Vehicle (BEV) / Plug-in Hybrid (PHEV) / Hybrid
cafvType	Clean-alt-fuel eligibility (e.g. CAFV-eligible)
electricRange	Electric range in miles
dolVehicleId	DOL vehicle ID
electricUtility	Home electric utility

Note on what this is not: this is a point-in-time fleet snapshot (EVs on WA roads now), not a real-time registration-event stream. Its power is distribution and trend analysis - model-year counts ARE the adoption curve (each row is a vehicle bought that year).

Typical questions it answers

• Which county has the most EVs? Aggregate by county -> King 48%, Snohomish, Pierce...
• What's the Tesla share? Aggregate by make -> Tesla ~41% of the WA EV fleet.
• How did adoption grow? Aggregate by modelYear -> the year-by-year EV registrations curve.
• Where are plug-in hybrids? Filter evType=Plug-in, aggregate by county.
• Long-range battery EVs - evType=Battery Electric, minElectricRange=250.
• A specific car / fleet mix - make=TESLA + model=MODEL Y, or county=King + modelYear=2024.

Aggregate mode

Turn on aggregate and it rolls up counts over the whole 294k-vehicle fleet instantly:

Output field	Meaning
key	The make / county / model year / EV type / city
vehicles	Number of EVs in that group
pctOfTotal	Share of the (filtered) total

Group by make (Tesla vs others), county (adoption geography), modelYear (the trend), evType, model, or electricUtility.

Inputs (all optional)

Input	What it does
county	County - "King" or "King County" both work (case-insensitive)
make	Make - substring works ("Tesla", "alfa", "land rover"), case-insensitive
model	Substring on model (e.g. MODEL Y)
evType	Substring on type: Battery Electric, Plug-in, Hybrid
cafvType	Substring on clean-alt-fuel eligibility
city	Substring on city
electricUtility	Substring on utility
yearFrom / yearTo	Model-year range (e.g. 2020-2026)
minElectricRange	Only EVs at or above this electric range (miles)
aggregate + groupBy	Roll up by make / county / modelYear / evType / model / city / electricUtility -> vehicles + share
maxResults	Cap the number of records (default 200)

Low cost

From $0.001 per record - with a per-run charge cap so even a full-corpus aggregate can't surprise-bill.

Washington's adoption-rate charts look like queryable datasets, but their backends return nothing - so every county / year / make trend here is computed from the underlying ~294k per-vehicle records, not a pre-baked chart. We also strip the ~0.3% of rows that are out-of-state vehicles (California, Virginia plates) that sneak into WA's table, so a county count reflects actual Washington EVs. An unfiltered run returns the newest vehicles (highest model years) as a live slice of the fleet.

Data source & freshness

• Source: data.wa.gov - WA State EV Population (Socrata SODA API, free public, no login).
• Update cadence: DOL registration data, refreshed regularly - a live snapshot of WA's EV fleet.
• Coverage: every EV currently registered with WA DOL. (Note: the WA portal's EV adoption-rate charts are dashboard-only backends with no queryable API - the per-vehicle population dataset below carries that same trend.)