My husband and I are separated. I recently found out that our marriage certificate was never filed. What do I do. I know we will end up dividing our martial property. How can a county not file our certificate.

The county did not file the certificate, the person who married you did not send it to the county to file. Would suggest you contact an attorney before dividing up any property or seeing if you even have to formally get divorced.

My husband and I are separated. I recently found out that our marriage certificate was never filed. What do I do. I know we will end up dividing our martial property. How can a county not file our certificate.
How long have you been married and in what state?