Md Dmv MCP server

@pipeworx/md-dmv

Maryland DMV MCP — monthly registered-vehicle counts and electric/plug-in hybrid adoption by county and ZIP code, from the Maryland Motor Vehicle Administration (MVA).

Part of Pipeworx — an MCP gateway connecting AI agents to 1476+ live data sources.

Tools

for one month, with a genuine statewide total and each county's share of it. Answers "how many vehicles are registered in Montgomery County Maryland", "which Maryland county has the most registered vehicles", "how many cars are registered in Maryland".

• mddmvvehicle_registrations(county?, month?, limit?) — registered vehicles by county

plug-in hybrid registrations by county or by ZIP code for one month, with a Maryland total for context. Answers "how many EVs are registered in Montgomery County Maryland", "EV registrations in ZIP 20852", "which Maryland ZIP codes have the most EVs".

• mddmvevadoption(county?, zip?, month?, groupby?, limit?) — battery-electric and

Auth

Keyless.

Data sources

county, monthly. Fields: yearmonth ("2026/06"), county, vehiclecount. 25 rows per month (23 counties, Baltimore City, and a NULL bucket for registrations the MVA could not assign).

• — MDOT MVA registered vehicles by

hybrid registrations by county, monthly. Fields: yearmonth, fuelcategory ("Electric" | "Plug-In Hybrid"), county, count. ~464 rows per month.

• — MDOT MVA electric and plug-in

yearmonth, fuelcategory, zip_code, count. ~2,065 rows per month.

• — same, by ZIP code. Fields:

All three run monthly from 2020/07 to 2026/06 (latest as of 2026-07-29).

Gotcha: the Maryland WAF rejects query shapes, not queries

opendata.maryland.gov sits behind a Cloudflare WAF that answers certain SoQL query shapes with a "Just a moment..." interstitial — HTTP 403 with an HTML body — instead of data. It is reproducible, and it is specific to this one domain: data.ny.gov, data.wa.gov and data.ct.gov all accept the identical clauses without complaint. It was first hit from a deployed Cloudflare Worker, and has since been reproduced from a laptop too, so it is a property of the request, not of the caller's IP.

Confirmed to trip it:

Confirmed to work:

So this pack sends exactly one condition, pulls the whole month (at most ~2,100 rows), and does all county/ZIP narrowing, aggregation and sorting in code. That is cheap, and it is the difference between the pack returning data and returning an HTML challenge page. Do not "optimise" the filtering back onto the server.

A side benefit: because the complete month is always in hand, statewidetotalvehicles and marylandpluginvehicles are real totals rather than sums of whatever survived limit. The row-level sum is reported separately as sumofreturnedrows.

Gotcha: the same county is spelled two different ways

The registration file and the EV files disagree on punctuation for the same places:

Both tools fold punctuation away before matching, so a caller can pass either spelling.

Shortened. The full README is on GitHub.