Simisouri is a fictitious state in SimNation referred in DeAndre Wolfe's description text as the place he grew up. Twinbrook is the only known town in the state. As Twinbrook is at the mouth of the Simislaus Creek, it is likely that the creek is also in Simisouri. It's been confirmed that Twinbrook is the capital of Simisouri. It is based on the US state of Missouri.