Collin vs Dallas County Property Taxes: 75287 Saves $1,500/yr

Quick Answer: In ZIP code 75287, homes on the Collin County side typically pay about $1,500 per year less in property taxes than otherwise-identical homes on the Dallas County side, roughly a 0.25% rate delta applied to a median-priced home. Before you buy, check which county an address sits in; the ZIP spans both.

Most people don’t know 75287 is split between two counties. I get that, the ZIP boundaries ignore the political ones. But this is the kind of small detail that shows up in every monthly mortgage payment for the next 30 years, and it changes the math on more homes in Far North Dallas than buyers realize.

In my 28 years selling homes across DFW, I’ve had the county-line conversation more times than I can count. Someone puts an offer on a 4-bedroom in 75287, sees the estimated tax line on the closing worksheet, and blinks. “That’s a lot less than the last one we looked at.” Yes. That’s because this one’s in Collin County. The one down the street was Dallas County. Same ZIP. Different bill.

Why does 75287 cross county lines?

75287 sits on the northwest edge of Dallas County and the southwest edge of Collin County. The Addison / Far North Dallas area bleeds into the Plano / Carrollton side, and somewhere down the middle of neighborhoods like Country Brook and Trinity Mills, the county line cuts through. Whichever side a specific address lands on decides the tax bill, not the mailing city, not the school district, not the ZIP.

A few streets I’ve worked in 75287 where the county matters:

• Country Brook, most addresses on the northeast side fall into Collin County, Plano ISD
• Shepton / Plano West feeder pockets, mixed, verify each address
• Trinity Mills area, historically more Dallas County, but boundary changes have shifted some parcels
• Keller Springs corridor, split depending on block

Never assume. Every contract I write includes the county pulled from the Collin or Dallas central appraisal district, not the listing sheet and not Zillow.

How much is the real property tax difference?

Here’s the thing, “Collin vs Dallas County” isn’t just about the county tax itself. The total property tax bill in Texas is a stack (if you are new to how it all fits together, my DFW newcomer’s guide to Texas property taxes walks through the whole thing, exemptions and protests included):

• County tax
• City tax
• School district tax (usually the biggest slice)
• Community college tax
• Special districts (MUD, PID, hospital, etc. where they apply)

The county portion is only a small piece. What actually moves the needle between Collin and Dallas County is that the combined rate, once you stack the county, the overlapping city, and the ISD, tends to run about 0.2 to 0.3 percentage points lower on the Collin side in neighborhoods like 75287. On a $625,000 home, that’s roughly $1,250 to $1,875 per year. Call it $1,500 as a rule of thumb, but pull the actual rate for the specific parcel before you quote a number.

Some of that delta comes from Plano ISD (which is typically a few pennies per $100 cheaper than neighboring ISDs on the Dallas side). Some comes from the overlapping municipal boundary. The point isn’t the exact decimal, it’s that $1,500 a year, compounded over 10 or 20 years, is real money.

A worked example: 4227 Country Brook Dr

A home I have listed right now, 4227 Country Brook Dr, 75287, is on the Collin County side. Plano ISD. Four bedrooms, pool, listed at $625,000. The estimated annual tax there runs around $13,400 to $13,800 depending on the exemptions. A comparable 4-bedroom listed a mile south, same ZIP, but Dallas County side, Richardson ISD, would pencil in at about $15,000 to $15,500 on a similar valuation.

That’s $1,500 a year, every year, that stays in the buyer’s pocket. Over a 7-year hold (close to the DFW average) that’s $10,500 before you even think about the compounding effect on the mortgage’s interest side. It’s not nothing.

Keep in mind the tax delta is a recurring, annual number, and it’s only one part of the buying math. Your upfront closing costs and the earnest money you wire the day you go under contract are separate line items worth budgeting before you make an offer in 75287.

Which school districts correspond to each county?

In 75287, the common pairings look like this:

• Collin County side: primarily Plano ISD (Shepton, Plano West, Jasper feeders). Occasionally Frisco ISD on the northern edge.
• Dallas County side: mostly Carrollton-Farmers Branch ISD or Richardson ISD. A narrow sliver falls into Dallas ISD near the southeast edge.

The Plano ISD schools on the Collin side have been a draw for as long as I’ve been doing this. Shepton Middle School feeds into Plano West Senior High, and both are consistently ranked at the top of the Texas public-school lists. Families relocating to the Plano corridor for tech jobs, especially the Frisco tech corridor along the Dallas North Tollway, often put “Plano West feeder” in their non-negotiables list.

A key gotcha: Plano ISD serves parts of both Collin and Dallas counties. So being in Plano ISD doesn’t automatically mean Collin County. But being on the Collin County side of 75287 and in Plano ISD is the specific combo that gets you both the school ranking and the tax break.

When is the Collin County side not the better deal?

Honestly? When the specific parcel has special district taxes that a comparable Dallas County parcel doesn’t. A MUD (Municipal Utility District) or PID (Public Improvement District) can add another 0.3 to 0.7 percentage points to the total tax rate. Newer master-planned communities sometimes carry these.

Country Brook, built in the early 1980s, doesn’t have a MUD or PID, the taxes are straight county + city + Plano ISD. Cleaner bill. Newer construction out in the Frisco / McKinney corridor frequently does carry special districts, and those can eat the $1,500/year Collin advantage.

Other situations where county matters less than you think

• Buyers paying cash and not financing, the monthly-payment math is less visible day-to-day
• Households on fixed income with the over-65 homestead exemption, the delta between counties matters less because the exemption floor compresses it
• Short-term holds (< 3 years), the lifetime math shrinks

But for a family planning to stay 5 to 15 years, the county call compounds into real money. It’s one of the first things I flag at the offer stage.

How do I verify the county for a specific 75287 address?

The official sources, in order of reliability:

1. Collin Central Appraisal District (collincad.org), free parcel lookup. Enter the address; it tells you the county, the taxing units, the assessed value, and the last year’s tax bill.
2. Dallas Central Appraisal District (dallascad.org), same thing, Dallas side.
3. The actual tax receipt from the current owner, if a listing has been on the market, the current tax bill is usually available in the MLS attachments. Read it.
4. Title commitment during the option period, your title company will pull the official county designation. This is the one that matters at closing.

What I don’t rely on: Zillow, Redfin, Realtor.com, or the listing sheet. Those fields are populated by feeds that occasionally get it wrong on boundary parcels. In my experience, the CAD is always right.

Frequently Asked Questions

Q: Does the property tax difference affect my monthly mortgage payment? A: Yes. Lenders escrow property taxes into your monthly payment, so a $1,500/year delta shows up as roughly $125 less per month on the Collin County side. Over a 30-year fixed, that’s $45,000 before factoring interest or inflation. It’s not a rounding error.

Q: Can I claim the Collin County rate if my mailing address is Dallas? A: The taxing authority is based on the parcel location, not the mailing address. Plenty of homes on the Collin side of 75287 have “Dallas, TX 75287” mailing addresses. The tax bill still comes from Collin County. Check the CAD, not USPS.

Q: Do I need to protest my taxes annually? A: Honestly, yes, most years it pays for itself. Both Collin and Dallas CADs tend to bump assessed values aggressively, and the protest window closes quickly (usually May 15). You can protest yourself or hire a firm for a percentage of the first-year savings. I’ve had clients save $800 to $3,000 a year just by walking through the evidence at an informal hearing.

Q: Is the $1,500 number the same for a $400,000 home as a $700,000 home? A: No, it scales. A 0.25% rate delta on a $400,000 home is about $1,000/year. On a $700,000 home it’s around $1,750. The rule of thumb I use: about $200-$250 per year for every $100,000 of home value. Pull the exact rates before quoting specific dollar figures.

Q: If I buy on the Collin side of 75287, do I save on anything other than property taxes? A: Sometimes. Collin County residents often have access to slightly better homestead exemption terms at the county level, and some jurisdictions offer over-65 freezes that are more generous. But the ISD and city exemptions usually dominate, and those vary address by address. Check specifically, don’t generalize.

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Three takeaways if you’re house-shopping in 75287:

1. Pull the county from the CAD, not the MLS sheet. The ZIP crosses county lines; the listing agent may not have caught it.
2. Check the ISD and the county separately. Plano ISD + Collin County is the specific combo that stacks both advantages. Plano ISD + Dallas County is also possible and still beats Richardson ISD + Dallas County on the tax side.
3. Factor the savings into offer strategy. If two homes look similar on paper but one’s on the Collin side and the other’s on the Dallas side, the $1,500/year difference justifies paying a bit more up front for the Collin home. Over 10 years, the math is on your side.

If you want me to pull the actual CAD data for a specific 75287 address, or you want to see my current Collin County Plano ISD listing at 4227 Country Brook, text me at (972) 345-3516. I pick up my own phone.