To find out what a house sold for, there are several options available. Here are some ways to find out:

1. Real estate websites: Websites like Zillow, Realtor.com, and Trulia provide data on recent real estate transactions, including the sale price of homes. For example, Zillow has a page dedicated to recently sold homes in Monroe, MI, with data on 2951 transactions. Realtor.com also has a page with information on 345 homes that sold recently in Monroe, MI, with a median transaction price of $224,750. Trulia has a page with information on recently sold properties in Michigan.

2. Consulting with a Realtor: A real estate agent who works in the same market as the house you want to check on will have access to the local Multiple Listing Service (MLS), which contains in-depth information on all the houses for sale in the area, as well as quite a bit of historical sale data.

3. Checking with the listing agent: If the listing was recent enough, the agent’s information will still be available. Then you can call them up and simply ask for the information you need.

4. Looking at comparable properties: Realtors, appraisers, and homeowners all look at home sale histories when they are trying to identify the value of a house. By looking at comparable properties, you can get an idea of what buyers are willing to pay for homes.

Its important to note that the accuracy of the information on real estate websites may not always be guaranteed, so its best to confirm the information with a Realtor or the listing agent.