This very popular schools website lets you input a school name and see test scores, course offerings and parent/student reviews. The site also allows you to plug in an address to see all the schools nearby -- handy if the district allows open enrollment.
This site allows you to plug in a school and see test scores, as well as how it compares to other schools in the district and the state overall. It also provides boundary maps for each school.
Plug in a home's address, and see all the public schools nearby. Each listing provides a trove of school population data, but no test scores.
Plug in a home's address, and see all the private schools nearby. Each listing provides a trove of school population data, but no test scores.