tyjkot

Yep! OpenStreetMap all the way down. Leaflet for the map with OSM raster tiles, and Nominatim for geocoding the typed address (US-restricted). County boundaries are US Census data as TopoJSON (~0.8 MB), self-hosted and decoded client-side with topojson-client. Once that loads, clicking the map resolves to a county with a local ray-casting point-in-polygon check - no API call. County lines and labels only render for what's in the viewport past a zoom threshold. React + Vite around it. No backend, no keys, no paid APIs.

For easy reading:

- Frontend: React 18 + Vite, React Router

- Map: Leaflet, lazy-loaded when the tool page mounts

- Base tiles: OpenStreetMap raster tiles (free, no key)

- Geocoding: Nominatim (US-restricted), only for typed address searches

- County boundaries: US Census TopoJSON (~0.8 MB), self-hosted, decoded client-side with topojson-client

- Click-to-county: local ray-casting point-in-polygon - no API call

- County lines/labels only render for the visible viewport past a zoom threshold

If you've ever searched for a county finder, you've probably noticed that nearly all of them are loaded with ads. It becomes a race to use the search bar and get your result before the page turns into a digital labyrinth.

I made my own county finder. It's ad-free, and I think it's better than anything else out there.

I haven't tested all the edge cases yet, especially addresses that fall near county lines. However, for 95% of use cases, it's pretty badass if I do say so myself.

Let me know what you think, or if you have any suggestions.

I love when smart people catch liars.

Feels scammy… that’s all I’ve got to say.

Thank you for educating me on this.

Forgive my ignorance, but what is the purpose of finding prime numbers that are insanely large?

Lol I will only be replacing bulbs with OEM parts. Some vehicles come with xenon, LED, or HIDs and that will have to be replaced with proper bulbs.

As blinding as they are, if that's what the vehicle has I gotta put them back in.

I have all the tools to replace headlight and taillight housing and bulbs for probably most vehicles including semis.

For my Saab's headlight bulb replacements, I have to remove my front bumper and then the headlight housing unit itself, just to replace turn signal and headlight bulb. I am fairly mechanically advanced.

It's not quite just $10, it's $10 more than a single bulb would cost you at your local parts store. If you lookup how much a headlight bulb is these days, it's about $20. My service will be $30 flat for bulb replacements in my area with a small mileage fee for out-of-towners.

The great part about Minnesota, is most of us hate the cold. I however do not. Many people get lazy and will Doordash or find other convenient ways to have things delivered. Not many people want to change bulbs in the cold or bring to a mechanic to be over-charged. What my population is looking for is a service exactly like I am providing.

Again, the pricing of $30 per service is perfectly sustainable for me and I have no issues replacing most parts in vehicles, lights are a walk in the park for me.

*Will correct typos later, at work ATM.

What I really care about, is moving the world forward. This is a service that the area I am in, is lacking. I don't need to make excessive profit, I just need sustainable profit and I am happy to provide this service as it's well within my skills.

No bulbs at auto stores are inflated far too high to be a profitable parts for me. I have to order through a supplier and keep supply on-hand, which is honestly fine and more profitable for me.

Hey thank you for that idea! I am going to be adding in headlight/taillight housing replacements as well, but I do like the idea of wiper blade replacement, I may keep that on the back-burner for some time until demand approaches.

However, the headlight restoration idea is a fantastic one. Definitely will add this to my list of primary services after launch.