If you can hit a genuine c6 that doesn't sound like a screech then pretty much any choir is going to want you as a soprano. Very little choir music (in the usual classical repertoire) calls for that note but you see it sometimes. Being able to produce it suggests that you can also handle the notes in the range just below it (G5,A5,B5) and many choirs struggle around there.
At the other end of your range d3 is good and would allow you to take part as a contralto but again you don't find parts going that low very often.
The top of your range would be more in-demand than the lower part I would expect. And, as everyone else has said, ask the choir director where he/she would like you to sing.