Private School
A child may satisfy compulsory attendance by attending an "educational institution," which includes independent, private, and parochial schools. Schools must keep daily attendance records open for inspection (§ 38-203) and file annual/monthly enrollment reports with OSSE (§ 38-205).
Amounts, dates, thresholds and licensing status are left to the linked sources.
Read the source:code.dccouncil.gov ↗code.dccouncil.gov ↗code.dccouncil.gov ↗osse.dc.gov ↗osse.dc.gov ↗ed.gov ↗