Quick Answer: A serial number lookup won't tell you where a bill has been — no public database tracks individual notes — but it can tell you three valuable things: which Federal Reserve Bank issued it, whether it's a star note replacement, and whether the number itself is a collectible "fancy" pattern worth more than face value. You can check the last two free with our fancy serial number checker and star note lookup.
Here's how to read every part of the serial number on your bill.
Anatomy of a US Serial Number
The serial number appears twice on the face of every US bill — upper right and lower left. A typical modern serial looks like:
B 7 2 4 5 3 1 0 8 F
- Prefix letter(s): who issued it, and (on newer notes) which series
- Eight digits: the note's unique number within its block
- Suffix letter or star: the print block — or a ★ marking a replacement note
Two letters never appear: O (looks like zero) and Z (reserved for test printings).
Decoding the District Letter
On $1 and $2 bills, the first letter maps to one of the 12 Federal Reserve Banks:
| Letter | District | Letter | District |
|---|---|---|---|
| A | Boston | G | Chicago |
| B | New York | H | St. Louis |
| C | Philadelphia | I | Minneapolis |
| D | Cleveland | J | Kansas City |
| E | Richmond | K | Dallas |
| F | Atlanta | L | San Francisco |
On $5 through $100 bills from Series 1996 onward, serials have two prefix letters: the first indicates the series year and the second the district. That's why a modern $20 serial might start with "MB" — M for the series, B for New York.
The series year printed on the bill's face, by the way, isn't necessarily the print year — it changes when the design or a Treasury signature changes.
Star Notes: The ★ Suffix
If the serial ends in a star instead of a letter, you have a replacement note — printed to stand in for a bill damaged during production. Star notes are printed in limited runs, and small runs are genuinely collectible.
Check yours in seconds with our free star note lookup, which matches your serial against official BEP production data to show the run size and rarity. For the full background, read what is a star note?
Fancy Serial Numbers: Where the Money Is
The most common reason to look up a serial number is to see if the digits form a collectible pattern. The big ones:
- Solid: 88888888 — the same digit eight times
- Ladder: 12345678 or 87654321
- Low serial: 00000001 through 00000100
- Radar: 12344321 — reads the same forwards and backwards
- Repeater: 45674567 — first half repeats
- Binary: 10101010 — only two distinct digits
Solids, perfect ladders, and serial number 1 notes have sold for thousands of dollars in top condition; radars, repeaters, and binaries typically bring modest premiums ($15–$100+ depending on pattern, denomination, and condition). Our rare serial numbers guide ranks all the patterns, and the fancy serial number checker tests your number against 15+ patterns instantly with rarity scores.
How to Look Up Your Bill, Step by Step
- Scan the bill with CashScan — the app identifies the denomination, series, and note type from a photo, so you know exactly what you're holding
- Check for a star — if the serial ends in ★, run it through the star note lookup
- Test the digits — enter the 8-digit number in the fancy serial number checker
- Assess condition — any premium multiplies with grade; see how to grade paper money
- Save it — CashScan keeps your scan history so you can track every note you've checked
Frequently Asked Questions
Can I look up a dollar bill by its serial number?
You can decode it and check it against star-note and fancy-pattern databases. No public registry tracks an individual bill's history or location.
What does the letter at the start mean?
The issuing Federal Reserve district on $1/$2 notes; on newer higher denominations, the first letter is the series and the second is the district.
What does a star at the end mean?
It's a replacement note. Small-run stars carry collector premiums.
Which serial numbers are worth money?
Solids, ladders, low numbers, radars, repeaters, and binaries — value scales with rarity, denomination, and condition.
The Bottom Line
Every serial number tells you where a bill came from — and once in a while, it tells you the bill is worth far more than its face value. Make checking a habit: scan the note with CashScan, glance for a star, and run interesting numbers through the free checkers before spending anything old or odd.
Related guides: Rare Serial Numbers on Dollar Bills · Rare $1 Bills Worth Money · Error Bills Worth Money
Download CashScan free on the App Store to identify any bill instantly.
