I'd dig deep and search for your goals in RE and then see if the investment matches your goal.

All three had positive net migration numbers (Houston had negative net migration because of the hurricane/flooding in 2017).Lastly, a lot are saying that Houston markets are already over saturated with investors,  the property prices are too high,  etc.Since I am trying to narrow my market search in investing in a 2-4 unit property would you guys agree that I should eliminate the Houston markets above and focus on Norman OK, Winter Garden Fl, and Boerne TX?

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Avoid internet searches, as tenants often get on there and leave scathing reviews -- sometimes reasonably, but sometimes not. 

You can get the information by googling your local Tax Assessor and searching for the property by address.

I've been searching properties on the property appraiser website and noticing that some properties don't show up when putting in the owners name or address.

I'm looking to connect with a realtor in the Springfield, Ohio area. Can anyone offer a recommendation of who to reach out to?

Not sure you are, but many cities you can search the tax assessors office public records to see when the last sale happened and even who owns it, again depends on your city.

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Here are some recommendations for you:Find and connect with other BP members that are in your area: http://www.biggerpockets.com/meetSet up keyword alerts to be notified of the topics that interest you: http://www.biggerpockets.com/alertsRead Beginner’s Guide: http://www.biggerpockets.com/real-estate-investingCheck out BP Podcasts: https://www.biggerpockets.com/podcastIf you wish to tag someone in the conversation on the forum, type @ followed by their name and then select the name of that person which should appear below the comments box.