Nice start to what can be a really useful tool. I did try some of the filters and I think there is a problem in your lookup database somewhere. I clicked on one of the listings in south Texas, Real County, and instead of the map showing the location of that property it took me to Uvalde, Texas which is quite a ways southeast of the property.

I saw similar things for a property in Joshua Tree, California that had no address, just a street name.

I would do as /u/ecommerceguy has suggested and at the very least add a toggle for State and County lines, and label roads and towns and other useful information.

As a feature that you could consider eventually adding for those who are interested in finding a rural property to land on, consider adding a toggle that can show the locations of the closest power and water access for a property using an labelled icon or other visual aid.

Sometimes the biggest challenge in determining whether you should purchase a property that you can live on is to find a place that is close enough to existing infrastructure that it doesn't cost more than the land value to gain access to water. Electricity is less important unless you are far enough north that your exposure limits your collection ability so that battery storage becomes a critical cost to consider.

With that in mind, adding info about solar suitability could be useful.

Here is a Google maps project that can help evaluate options for a property.[0]

[0]https://mapsplatform.google.com/maps-products/solar/

Water is the biggest challenge in most places. I see that you recommend pulling state wells logs for the properties. Perhaps a link to that resource would be useful. I have done water availability and quality work now for a couple of relatives in different states. There is a lot of variability in the data available and the quality of the data. Knowing which agency handles private and public well locations helps a lot. Knowing which agency monitors water quality locally also is important.

I know this is part of due diligence for an interested buyer. I think for your tool to maximize value to a buyer it should make it easy to find the bits of information that can steer the buyer to a conclusion.

Land Atlas – soil, farmability, and crop analysis for land listings