Why No Two Websites Agree on Alpharetta's Median Home Price

Redfin's own market page for Alpharetta carries two numbers that contradict each other by more than seven percentage points, on the same URL, updated within weeks of each other. Over the three months ending June 2026, the site lists Alpharetta's median sale price at $792,000, down 4.3 percent from a year earlier. A few lines down the same page, the average house price for the most recent month comes in at $751,000, up 3.5 percent year over year. One statistic says the market is cooling. The other says it's warming. Neither is wrong.

Widen the search and the spread gets worse. Houzeo's July data puts the median at $740,000, up 12.12 percent year over year. A 30-day snapshot from another data provider shows $850,000, up 18.9 percent. A regional market report built on May 2026 figures lands on $785,000 and shows an 11 percent year-over-year drop. That's a swing of roughly 30 percentage points in direction alone, all describing homes sold in Alpharetta, Georgia, within the same general window of 2026.

A relocation buyer comparing these pages before a house-hunting trip has every reason to assume someone made an error. Nobody did. The disagreement is structural, and once you see the mechanism, it tells you something more useful than any single median ever could.

Same City, Different Math

Part of the gap is simple arithmetic. A median and an average answer different questions. The median is the middle sale, unaffected by how extreme the top or bottom of the range gets. The average gets pulled by outliers, so a handful of multimillion-dollar closings in a given month can lift it well above what a typical buyer actually paid. Redfin's own page shows this in miniature: the median (middle house) fell over three months while the average (mean of all houses) rose over one month, because those two statistics were never measuring the same thing to begin with.

Time windows compound the problem. A 30-day snapshot, a one-month figure, and a trailing three-month average will each catch a different slice of the same seasonal market, and Alpharetta's numbers move enough month to month that the window you choose can flip the story. Movoto's own market page uses Alpharetta's $799,000 figure as a "list price" in one section and describes homes as having "sold for a median price of $799,000" in April 2026 in another.

None of this is unique to Alpharetta. But Alpharetta has a second layer of distortion that most markets don't, and it has nothing to do with statistics.

The Map Problem Underneath the Math Problem

Country Club of the South is one of the best-known gated communities carrying an Alpharetta address. It's a 900-acre development with more than 700 custom-built estates, price points that range from roughly $1.1 million to north of $3 million, built around a private Jack Nicklaus Signature golf course completed in 1987. Ask most agents where it is and they'll say Alpharetta without hesitating.

It's actually in Johns Creek.

The community sits inside Johns Creek's municipal boundary while its homes carry Alpharetta mailing addresses, a mismatch that goes back to how postal ZIP codes were drawn long before either city's current limits were finalized. That gap between mailing address and municipal boundary is the quiet variable behind a lot of the price confusion. Automated valuation tools and portal aggregators mostly pull data by ZIP code, because ZIP code is what's attached to the address field in most public records. A tool built that way will scoop Country Club of the South's estate sales into its "Alpharetta" pool. A dataset built instead from the MLS city field, which tracks actual municipal jurisdiction, would leave those same sales out, because on paper they never happened in Alpharetta at all.

Multiply that by every other reason a home can carry an Alpharetta address without sitting inside Alpharetta city limits, unincorporated Fulton County parcels, Milton-adjacent acreage, and the ZIP-versus-city gap stops being a rounding error and starts being a meaningful share of whatever the top or bottom of a given month's range looks like. Public listing data currently shows Alpharetta-addressed properties asking as much as $6.7 million for a third of an acre in the 30009 corridor and multiple properties in the $6.2 million to $9 million range on multi-acre parcels carrying Milton-area addresses in 30004. Fold both ends into the same "Alpharetta" pool used to calculate an average, and you can see exactly how one tool's mean drifts upward while another tool's median, less sensitive to a few outsized closings, holds closer to the middle of the pack.

What the ZIP Codes Actually Show

Here's a snapshot of how differently the same sources describe the same market, all within recent months of 2026:

Drop below the city level and the picture gets sharper, not clearer. Zillow's own citywide figure for Alpharetta puts the average home value at $722,997, down 0.4 percent over the past year as of late July 2026. A separate Zillow page tracking a specific pocket within Alpharetta called Webb shows $656,261, up 2.6 percent over the same period, a $66,000 gap between two Zillow products measuring different footprints inside the same city. The same 30-day data provider's ZIP-level breakdown for 30009, the downtown and Avalon corridor, shows a median of $885,000, up 2.6 percent year over year with homes moving in 20 days, faster than the citywide 29-day median it reports separately. A recent 30005 snapshot, updated within the last several days, shows a median of $764,000, down 1.3 percent year over year, a milder decline than the double-digit drop the regional market report shows for the city as a whole.

RealtyTrac's own figures for Alpharetta's four ZIP codes show active-listing values ranging from $5,855,342 in 30009 down to $178,336 in 30022, a spread wide enough on its own to explain why a citywide blend and a single-neighborhood snapshot rarely land on the same number. Narrow the lens to one ZIP code and the range doesn't tighten much. RealtyTrac's recently sold figures for 30022 alone run from $2,276,967 down to $159,055, meaning that ZIP code is stitching together very different products, condos, older starter homes, and estate-scale parcels, into a single number that describes none of them well.

What This Means If You're Comparing Alpharetta to Somewhere Else

None of this means the market is unknowable. It means a single headline figure, pulled from any one site, is the wrong tool for comparing Alpharetta to another suburb or for deciding whether now is the right window to buy. A more useful comparison asks for the same basis on both sides: median sold price, not average, over the same trailing window, filtered to the actual municipal boundary rather than a ZIP code that may or may not include neighborhoods like Country Club of the South.

It also means ZIP code alone isn't a fine enough lens for judging what a given budget actually buys. A buyer comparing $785,000 across two ZIP codes could be comparing a townhome near the employment corridor to a single-family home on a larger lot, or a downtown Avalon-adjacent condo to an older resale near North Point. Alpharetta's limited remaining land keeps new single-family construction thin relative to demand, which is part of why entry-level buyers increasingly land in condos and townhomes near the job centers while estate-scale product in communities like Country Club of the South holds a separate price tier entirely. Two very different housing stories, both technically happening inside the numbers a portal calls "Alpharetta."

For a buyer relocating for work, or an owner trying to price a sale against what the internet says the market is doing, the fix isn't finding the one correct website. It's asking which boundary, which time window, and which statistic sit behind whatever number just got quoted.

A Few Questions Worth Asking Before You Trust a Number

Is Country Club of the South actually in Alpharetta? Its homes carry Alpharetta mailing addresses, but the community sits inside Johns Creek's municipal limits. Whether a given dataset counts it as "Alpharetta" depends on whether that dataset is built on ZIP code or on city boundary.

Why do Zillow and Redfin show different numbers for what looks like the same market? They're often measuring different things. One might report a median sale price over a rolling window, another a smoothed home-value index, another an average that includes every closing regardless of how far it sits from the middle of the range.

Is Alpharetta's 2026 market a buyer's market or a seller's market right now? The honest answer is that it depends on which ZIP code, which product type, and which month you're looking at. Downtown and Avalon-adjacent product has moved faster and held value better in some recent snapshots than the citywide figure suggests, while the broader market has shown more price flexibility for sellers than it did a year earlier.

Comparing Alpharetta to another North Atlanta suburb, or trying to figure out what a specific budget actually buys once you account for ZIP code, product type, and municipal boundary, is exactly the kind of question worth putting in front of someone who works these numbers daily rather than reading them off a single page. Tasha Kline can walk you through what the current data actually means for the specific pocket of Alpharetta you're considering.