Which of the sixty-two you are actually in
The county has sixty-two municipalities and one courthouse, and the name on a listing is frequently not the government that will tax you. Norristown, Pottstown and Collegeville are incorporated, so there the name on the envelope is also the taxing body. Blue Bell is a census-designated place inside Whitpain Township. Plymouth Meeting sits in Plymouth Township and Whitemarsh Township at once, which means two municipal rates and two bill dates under one mailing address.
That is why the first question here is which township or borough a house stands in. The line sets the millage, the school district and the earned income tax. A ZIP code will not answer it, and neither will the road name.
The tax bill that follows from that line
Two levies land on every parcel in the county: 5.462 mills of county tax and 0.49 mills for Montgomery County Community College, 5.952 together. The commissioners adopted that in December 2025 inside a $1.2 billion budget, up from 5.252 and 0.39 (the county’s 2026 millage sheet, read 26 August 2026). Everything after those two numbers is local.
Municipal rates run from Worcester Township’s 0.05 mills to Norristown’s 19.0, and the school district usually moves more money than the municipality does. Whitpain Township, where Blue Bell sits, totals 36.502 mills for 2026 with Wissahickon at 26.6. Pottstown Borough totals 66.833 with its own district at 45.28.
Those figures only mean something once you know what they multiply. Montgomery County last reassessed in 1996 — the Pennsylvania Supreme Court said so in Valley Forge Towers v. Upper Merion Area School District in 2017 — so an assessed value here is a 1996 value. The state bridges the gap with a Common Level Ratio factor, 3.36 for deeds dated 1 July 2026 through 30 June 2027, up from 3.25 the year before. Divide market by 3.36 and you land near what the county has on file: roughly thirty cents on the dollar.
Worked through, a $400,000 house is likely assessed somewhere near $119,000. At Whitpain’s 36.502 mills that is about $4,344 a year. At Pottstown’s 66.833 it is about $7,953. Same county, same base year, same house, about $3,600 a year apart, and almost all of the gap is the school district. Individual parcels wander a long way from the average, so treat both as estimates and ask the seller for the actual bill.
The houses run about a century wide
Pottstown Borough’s median year built is 1951 and 38.9% of its units went up in 1939 or earlier. Blue Bell’s median is 1983, with 42.4% of everything there built during the eighties. Between them sit Norristown at 1957, Collegeville at 1973 and Plymouth Meeting at 1976 (Census ACS 2020–2024 five-year estimates).
On a loan file that range turns into different questions. Pre-1940 stock raises knob-and-tube wiring, small original service panels and asbestos pipe wrap, and an appraiser records what is visible. Oil heat is still ordinary in places you might not guess: 36.1% of Pottstown households, 18.8% in Collegeville Borough, 15.0% in Blue Bell. A tank, buried or in the basement, carries its own paperwork. Anything with a homeowners association or a condominium deed adds a project review on top of the appraisal, which is a question about the building, separate from anything to do with the buyer.
What a lender will ask about here
Water first, because the county has two rivers’ worth of history. The Schuylkill gauge at Norristown has a 13-foot flood stage and a record crest of 26.85 feet, set by Ida on 2 September 2021. The gauge upstream at Pottstown still has Agnes on top at 29.97 feet from 23 June 1972. The Perkiomen at Graterford reached 24.23 feet during Ida, its highest reading on record (NOAA river gauge records, read 26 August 2026). If a house sits anywhere near the water, the FEMA map and a flood insurance quote belong in the file before the offer.
Then the flat facts. Transfer tax is 2.000% at every Montgomery County address, split 1% state, 0.5% municipality, 0.5% school district, and it does not move from township to township here. The swing is at the county line, where Philadelphia charges 4.578% and Radnor and Upper Darby charge 2.5%. Custom splits it half each, both sides are on the hook, and the agreement of sale controls. A refinance owes none of it.
Earned income tax moves quietly and moves a lot. Forty-five of the sixty-two municipalities sit at exactly 1.00% for a resident, Norristown is the county’s highest at 2.10%, and Lower Merion and Upper Merion levy nothing at all, township and school district both (the state’s official tax register for 2026). On $150,000 of earned income that is a $3,150 difference between two addresses twenty minutes apart.
Two dates are worth putting on the fridge. The homestead exclusion cuts school taxes only, the application goes to the county assessment office, and the Act 1 deadline is 1 March — settle after it and the exclusion starts the following year. The assessment appeal deadline is 1 August, and a fresh arm’s-length purchase price is the strongest evidence an appeal can carry.
Next town over
The pages under this one go municipality by municipality: Norristown, Pottstown, Collegeville, Blue Bell and Plymouth Meeting. Each has its own millage, its own bill dates, and its own short list of things an appraiser stops to look at.
What to do next
Have the address ready, and the municipality if you know it. If you do not, say the street and the nearest cross street; that is usually enough to work it out. A licensed Pennsylvania lender calls you back, usually the same working day and by the end of the next working day at the outside, with the property tax worked from the millage that actually applies. Call the number at the top, or put the details in the form and send it along. The arithmetic starts from the right township either way.