Congressional Districts usually include a large number of neighborhoods:

View New York congressional district maps and representatives
View the congressional district maps of UNHP

Have you found the congressional district of your service area?

Infoshare Online The Infoshare website allows users to access an abundance of NYC data (census, housing, education, crime, health, commerce, etc.) by many geographical definitions, including congressional district. Registration required. Fees required after introductory period.

Kidscount Database For child-related data, the Kidscount Database on the Annie E. Casey Foundation's website allows you find data, create profiles, and obtain profiles at the borough (county), city and congressional district level.