Michiana ZIP codes and counties, town by town

Michiana is a region, not a jurisdiction. It has no government, no boundary on any official map, and no single county seat — which is why the simplest questions about it are weirdly hard to answer. What county is Granger in? What is the ZIP code for New Buffalo? Is Three Oaks in Berrien County? This page answers all of them in one place, and then explains the part the lookup tables leave out: in a two-state region, the county line is not trivia. It sets your property-tax formula, your disclosure paperwork, and what happens if a sale goes sideways.

The seven counties

Michiana spans seven counties — five in Indiana, two in Michigan. Every town on this site sits in one of them. Typical home values below run through June 2026, from the current monthly market report.

Berrien is the most expensive of the seven, pulled upward by its Lake Michigan shoreline. Marshall County posted the largest annual gain at +7.0%. The county-level spread is narrow — roughly $235K to $295K — which is worth remembering when a single town inside one of them reads as an outlier.

Every town, its ZIP, and its county

Principal ZIP codes below. The larger cities — South Bend and Elkhart especially — carry additional ZIPs beyond the ones listed; these are the ones a form or a search will normally want.

The addresses that confuse people

Granger, 46530

Granger is the one that trips up every form. It is in St. Joseph County, Indiana, ZIP 46530 — but it is not a city or a town. It is an unincorporated community across Harris and Clay townships, with no city hall and no municipal tax line on the bill. That is a large part of why it is the region's premium address; the Granger guide works through what that means for a buyer.

Mishawaka's county edge

Mishawaka is a St. Joseph County city, but its eastern growth has carried addresses toward the Elkhart County line. Two houses on the same road can sit in different counties, which means different assessors, different tax rates, and different school enrollment. Always confirm the county on the deed rather than on the mailing address.

Osceola and the 46561 pocket

Osceola is a small St. Joseph County town on the Elkhart corridor with its own ZIP, 46561, and a median sale price that swings hard on tiny volume. It is a good illustration of why a single month's number from a small market should never be read as a trend — how to read the data covers that trap in detail.

Michigan City is in Indiana

The region's most reliable source of out-of-state confusion. Michigan City is an Indiana city in LaPorte County, ZIP 46360, on the Lake Michigan shoreline. It is named for the lake, not the state.

Why the county matters more than the ZIP

A ZIP code is a mail-routing convenience. The county is the unit that actually governs your transaction. Property assessment, the recorder's office where your deed lands, the treasurer who runs a tax sale, and the court that would hear a foreclosure are all county-level. When the two disagree — and in a region stitched together from seven counties they often do — the county wins.

That matters most on the tax bill. Indiana caps homestead property tax at 1% of gross assessed value, with 2% and 3% caps for other property classes. Michigan works differently: taxable value is capped while you own, then uncaps to the assessed value when the property transfers, and the Principal Residence Exemption removes a block of school operating mills for owner-occupants. Two houses of identical value, one in Cass County and one in St. Joseph County, produce genuinely different annual bills — the two-state property tax guide runs the comparison.

The state line is the real border

Seven counties, but only one line that changes the rules. Indiana and Michigan diverge on nearly everything procedural: the disclosure form you must deliver, whether a foreclosure goes through a court, how long a redemption period runs, and whether a transfer tax is owed at closing. A buyer shopping Granger against Edwardsburg — a five-minute drive — is comparing two different legal systems, not two neighborhoods. The relocation guide maps the practical differences.

Using this before you buy or sell

Before you write an offer, confirm three things that this table starts you on and the county confirms: which county the parcel is actually in, what the current assessed value and tax bill are, and which school district serves the address. All three are public record at the county level, and all three move money. If you are buying direct or selling without a brokerage, nobody else is going to check them for you — which is the honest argument for doing it deliberately rather than assuming the mailing address told you the truth. Running your own comps starts with the same step: pull the comparable, confirm the county, then compare.

Frequently asked questions

What county is Granger, Indiana in?

Granger is in St. Joseph County, Indiana, and its ZIP code is 46530. It is not an incorporated city or town — it is an unincorporated community spread across Harris and Clay townships against the Michigan state line, northeast of South Bend and Mishawaka. That is why there is no Granger city hall and no municipal line on the property tax bill.

What is the ZIP code for New Buffalo, Michigan?

New Buffalo, Michigan uses ZIP code 49117, and it sits in Berrien County in the far southwest corner of the state, right where the Indiana line meets Lake Michigan. It is the most expensive market covered on this site, with a typical home value of about $681,000 through June 2026.

What county is Three Oaks, Michigan in?

Three Oaks is in Berrien County, Michigan, ZIP code 49128, a few miles inland from the New Buffalo shoreline. Its typical home value is about $350,000, and it posted the region's largest annual gain at +13.2% through June 2026 — on very thin volume, so the figure should be read with care.

What county is Dowagiac, Michigan in?

Dowagiac is in Cass County, Michigan, ZIP code 49047. Cass County is the smaller of the two Michigan counties in Michiana, sitting directly north of the Indiana line between Berrien County and the Elkhart corridor. Dowagiac's typical home value is about $234,000.

What counties make up Michiana?

Seven: St. Joseph, Elkhart, LaPorte, Marshall and Kosciusko in Indiana, plus Berrien and Cass in Michigan. Michiana is an informal regional name rather than a legal jurisdiction, so no official boundary exists — but those seven counties are the ones whose housing markets actually move together.