Why enrollment is falling

Nine years of enrollment, and where it's headed

Actual enrollment through SY 2025–26, then two forecasts — the demographic baseline and the same baseline plus expected students from approved new housing — with MCPS's own projection for comparison. The shaded band marks the forecast years.

County total peaked at 164,888 in SY 2019–20, dropped during the pandemic, briefly rebounded, and has declined every year since. The official published figure for SY 2025–26 is 156,050; the 155,987 used for the computed statistics on this page is our by-school, by-grade sum.

Driver 1 — Fewer kindergartners

The clearest single cause is smaller kindergarten classes. Kindergarten peaked at 11,506 in 2019–20; by 2025–26 it had fallen to 9,875, down 14%. That tracks the county's own birth decline: Maryland's September-1 cutoff maps each kindergarten class to babies born about five years earlier, and MCPS has historically enrolled roughly 85% of that birth cohort. Because the children who will start kindergarten through 2027–28 are already born, this part of the decline is effectively locked in — no policy change enrolls a child who was never born. The chart pairs each year's births-implied kindergarten (the birth cohort times the historical capture rate) against actual and forecast kindergarten; they move together.

Birth cohorts (Sept-1 cutoff) are observed through the 2027–28 kindergarten class; after that, kindergarten is projected. Actual K tracks the births-implied line closely, confirming the roughly 85% capture rate.

Driver 2 — Families moving, students leaving

Kindergarten is not the whole story. Once children are in the system, each class keeps changing size as it moves up — families move into the county, others move out, and students switch between MCPS and private, charter, or home schooling. The chart below follows real classes: each line is one graduating class plotted by the grade it was in, so you can watch a single group of children grow or shrink as it ages, rather than compare different grades in different years.

Two patterns repeat across every class. Through elementary school the lines drift upward — the county gains students in the early grades as young families arrive. At grade 9 every line jumps, because a wave of students enters public high school from private and parochial K–8 schools. Then, through high school, the lines slope down: each class loses students as families leave and older students exit the system. So elementary growth doesn't simply carry up the grades — every stage has its own arrivals and departures, and high school is where the county gives students back.

What's new is how steep that high-school decline has become. In the most recent year, 2025–26, classes thinned faster than older classes did at the same ages — a net outflow concentrated in a handful of high schools with large recently-arrived-immigrant enrollments. Whether that deepens or stabilizes is the single biggest swing factor for next year's count. (The small dip the lines share around 2020-21 is the pandemic year, when the county briefly lost students at almost every age.)

Each line is a real MCPS class, followed by its headcount as it moves up one grade a year (the axis is grade, not calendar year). Classes grow through elementary as families move into the county, hold in middle school, jump at grade 9 as students enter public high school from private and parochial K–8 schools, then thin through high school. Recent classes sit lower because kindergarten classes have been shrinking — that is Driver 1 above.

Is new development offsetting the decline?

New housing does add students, but not enough to reverse the trend. Montgomery County has a large pipeline of approved-but-unbuilt residential projects; converting them to students with the county's official student-generation rates, weighting fully-approved projects near-term and not-yet-entitled future phases much more cautiously (low weight, delivering late in the window), yields a probability-weighted estimate of new enrollment. Over five years that adds about +2,693 students against a baseline decline of −7,038 — a net loss of −4,345. Over ten years development contributes about +3,915, against a baseline decline of −13,243, for a net of −9,328.

In short, the approved pipeline offsets a bit more than a third of the projected five-year decline and about 30 percent of the ten-year decline. It softens the drop; it does not stop it. This is county-total yield — where those students land matters school by school, and a few attendance areas absorb most of the growth. The school-level view, including which schools the pipeline pushes over capacity, is on the capacity outlook page.

Source: MCPS official enrollment (Sept 30, 2025); MSDE/SAAG by-grade history; MD Vital Statistics resident births through 2023 (2024 provisional); Montgomery Planning pipeline snapshot 2026-06-02; MCPS vintage-2025 projections · Updated: 2026-07-31