Teachers Federal Credit Union 450 Patchogue Rd, Port Jeff Sta, NY11776 One of the largest credit unions in the country, Teachers Federal has been serving Suffolk County since 1952. Any Long…More Islander can apply to open an account at one of 21 branches in Suffolk County with just $1 minimum opening balance. Free checking and no ATM fees are just some of the benefits of joining this non-profit, member-owned credit union. This historic Port Jefferson building, complete with fireplace, is in the parking lot of Jefferson Plaza. Skip the line and use the "express drop" for member deposits.