N.Y. Educ. Law § 3242
The trustees or board of education of every school district may cause a census to be taken of all children between birth and eighteen years of age, including all such facts and information as are required in the census provided for in section thirty-two hundred forty-one of this part. Such census shall be prepared biennially for children between ages five and eighteen who are entitled to attend the public schools without payment of tuition in duplicate in their respective school districts, and one copy thereof filed with the teacher or principal and the other copy filed with the district superintendent or superintendent on or before the fifteenth day of October. For pre-school students from birth to five years of age, such census may be prepared and filed biennially on or before the fifteenth day of October. Such census shall include the reports and information required from cities as provided in section thirty-two hundred forty-one of this part. All information regarding a student with a disability under the age of twenty-one years shall be filed annually with the superintendent of the board of cooperative educational services of which said district may be a part.
N.Y. Educ. Law § 3242