About this directory

Find Interlock is an independent directory of ignition interlock device installers in the United States. It currently lists 11,329 installer locations in 5,106 cities. We are not an interlock provider, we do not sell devices, and we do not take referral fees from the shops listed here.

Where the data comes from

1. The location pages that Intoxalock, Smart Start and LifeSafer publish for every shop in their networks.
2. Google Maps business listings for every interlock brand, including Low Cost Interlock, RoadGuard, Guardian, ALCOLOCK, Draeger and independent installers.
3. Address matching between those two sources, so that one shop that installs three brands appears once with all three brands shown.

What the tiers mean

Confirmed

Confirmed by two sources: the provider's location page and an active Google Maps listing.

Listed

Listed by one source only.

Unconfirmed

Only found on Google Maps, and that listing is marked closed. Call before you go.

What we do not know

Prices, lease terms, and same day availability change often and differ by provider and by state program. Hours come from the provider page or the Google listing and may be out of date. Always call the shop before you go. Nothing on this site is legal advice.

Found a mistake?

Every listing has a report link. You can also contact us about a shop that has moved, closed or changed brands.