I can`t find were my father got married?

Question:

I can`t find were my father got married?

He had a first wife and they married after 1920 and were seperated in 1930.Any ideas,I`m stumped.Name William W. Conway.Had one daughter Cathleen/Kathleen Conway.Lived in New Jersey and Pa.Mostly I believe in N.J. He was born 1900.
Thanks in advance.

Additional Details

5 months ago
I don`t know the county,though I believe they lived in Cape May.I`ll try the capital and see where that takes me.Thanks.
Happy Val. to you too.

5 months ago
Thanks ChrisI I`ll try and also Genevieve thanks lots .I`m going to try your ideas too.;
Wendy there are two william conways on 1920 census.Neither married.I think my dad was the chauffer.Not married yet.1930 he`s living with mother and two brothers.Wife not mentioned.The daughter was born in between those dates.I don`t know first wifes name.

Best Answer - Chosen by Asker: 5 months ago
I don`t know the county,though I believe they lived in Cape May.I`ll try the capital and see where that takes me.Thanks.
Happy Val. to you too.