Worth It Calcs

Milk Code Finder

Where was your milk really processed?

Find where your milk was processed using the code on your carton. See the plant, its location, and what the label doesn't tell you.

Two numbers. One surprising answer.

Most U.S. milk prints a plant code near the expiration date. Enter the two numbers below.

Example: 24 – 013. You can also paste the whole code, like 24-013, into either box.

Can't find the code? See where to look.

Same plant, different price?

Compare two milks

Enter two prices to see the real cost per gallon. Add the plant codes too, and we'll check whether both cartons come from the same plant.

Price per gallon. Cost per year.

Milk A Carton size
Milk B Carton size
Where to look on a gallon or carton
A plastic milk jug with the code printed on the cap and on the neck next to the sell-by date 24-013 SELL BY NOV 12 24-013 B2 Illustration — not a real label
Plastic jugs: look at the cap and the shoulder or neck of the jug, next to the “sell by” or “use by” date. The code is the two-part number with a dash, like 24-013. Ignore extra letters or times printed after it.
A paper milk carton with the code printed on the top fin near the date NOV 12 51-4108 Illustration — not a real label
Paper cartons: check the top fin or the gable top, near the date. Small half-pints and creamers often print it on the top seam.

The first number (1–2 digits) is the state where the plant is. The second (usually 2–5 digits) is the plant number. Some states use letters, like 43-RM 08.

Full guide to finding the code →

Read the label like an insider

A plant lookup alone can't tell you any of these things about your carton. Here's what each label claim actually means.

Plant code

Matches a facility listed in the FDA dairy directory. It doesn't identify the supplying farm or establish that two milk products are identical.

USDA Organic

A legally defined claim under the USDA National Organic Program, with production rules and third-party certification. Look for the USDA Organic seal and the certifier named on the package.

Grass-fed

There's no single federal definition for grass-fed milk. Look for the specific certification on the package and check that program's own requirements.

Ultra-pasteurized

Heated to a higher temperature than regular pasteurization, which gives a longer unopened refrigerated shelf life. Once opened, follow the label.

Lactose-free

The lactose has been removed or broken down (often with the lactase enzyme). It's still dairy milk.

A2 milk

Refers to the type of beta-casein protein in the milk (A2 rather than A1). It is not the same as lactose-free and still contains lactose.

Ultra-filtered

Milk passed through filters that change the concentration of components — typically more protein and less sugar per cup than regular milk.

Quick answers

What does the code tell me?

This code matches a facility in the FDA Interstate Milk Shippers List. It does not identify the supplying farm or prove that two cartons contain identical milk.

Does the same plant mean the same milk?

No. One plant can bottle several brands to different specifications, from different milk supplies, on different days. Same plant is a fact about the facility, not proof the milk inside is identical.

What if my carton has no code?

Most U.S. milk carries one, but it isn't guaranteed: the rules also let a processor identify itself another way, such as printing its name and address. If you can't find a two-part number near the date, look for “processed by” or “bottled by” text instead. You can still use the price comparison without a code.

Why wasn't my code found?

Check the digits first. If they're right, the plant may sell only inside its own state (FDA's list covers interstate shippers), may have changed numbers, or may have closed. “Not found” means not in the current FDA directory — not that the plant doesn't exist.

Is this an official government site?

No. It's an independent, free tool from Worth It Calcs. The plant records come from FDA's public list, and every result links to the FDA page so you can check it yourself. How it works.