Navy Federal Routing Number on a Check: What the Fraction Symbol Means

Last verified against primary sources: October 5, 2026.

On a Navy Federal check, the little fraction in the upper-right corner ends in 7497/2560. That fraction and the nine-digit number printed in magnetic ink along the bottom are two forms of the same thing: 256074974. The Federal Reserve says so in Regulation CC. But the fraction carries only eight of the nine digits — the ninth, the check digit, was bolted onto the bottom line in 1978 and never added to the corner.

The short answer

Where it is printed	What it is called	Navy Federal value
Bottom line (nine-digit form)	Routing number	256074974
Corner fraction — below the slash	Federal Reserve routing symbol	2560
Corner fraction — above the slash, after the dash	ABA transit number	7497
Corner fraction — before the dash	1911 geographic prefix	Not published by anyone official — read it off your own check
Bottom line only	Check digit	4 (never appears in the fraction)

So a Navy Federal check should read something like [prefix]–7497/2560 in the corner and 256074974 along the bottom. If you want the background on reading a check generally, see where the routing number sits on a check; this page is about why the two forms are linked, what each piece was originally for, and the one piece nobody publishes.

Two forms of one number — stated officially

Regulation CC is the Federal Reserve rule that governs funds availability. Its Appendix A opens with the clearest sentence anyone has published on this subject:

“Each bank is assigned a routing number by an agent of the American Bankers Association. The routing number takes two forms: a fractional form and a nine-digit form. A paying bank generally is identified on the face of a check by its routing number in both the fractional form (which generally appears in the upper right-hand corner of the check) and the nine-digit form (which is printed in magnetic ink along the bottom of the check).” — 12 CFR Part 229, Appendix A, paragraph A

Two things follow immediately. First, the fraction is not decoration and not a different number — it is the routing number, printed in its pre-computer form. Second, Appendix A is a live regulation, not a historical footnote: its whole job is to decide how quickly a check clears. We come back to that below.

The denominator: why it has to be 2560

Appendix A, paragraph B supplies the conversion rule:

“The first four digits of the nine-digit routing number (and the denominator of the fractional routing number) form the ‘Federal Reserve routing symbol,’ and the first two digits of the routing number identify the Federal Reserve District in which the bank is located.… Adding 2 to the first digit denotes a thrift institution.”

Run that backwards on 256074974. The first four digits are 2560, so the denominator must be 2560. Strip the thrift marker — the regulation's own arithmetic, 25 minus the added 2 leaves 05 — and the second pair reads as the Fifth Federal Reserve District, which the Board's own list identifies as Richmond. Navy Federal is headquartered in Vienna, Virginia, inside that district. The number still points at where the institution sat when it was assigned.

One practical warning comes out of this. Appendix A lists both 0560 (the non-thrift version) and 2560 for that same region pair, and the full list runs to 325 routing symbols, 162 of them carrying the thrift prefix. It is worth knowing that, because a check whose corner reads 7497/0560 is not a Navy Federal check under another spelling: those eight digits reconstruct to a different number entirely, with a different check digit. Only 2560 goes with 256074974.

The numerator: where 7497 comes from

The regulation only explains the bottom half of the fraction. For the top half you have to go back to Federal Reserve publications from the era when the fraction was the primary routing device.

A Federal Reserve Bank of Atlanta article from the early 1950s, Highway Signs for Checks, describes the design:

“The ‘numerator’ indicates the transit number assigned to a given bank under the numerical transit system adopted by the ABA in 1911. Figures in the ‘denominator’ make up the routing symbol.” Its worked example is the Federal Reserve Bank of Atlanta itself, 64–14/610: “The 64 in the ‘numerator’ is the number assigned to the state of Georgia, and the 14 is the number designating the Federal Reserve Bank of Atlanta.”

The cleanest proof is a Federal Reserve Bank of Dallas circular from October 19, 1977, which prints both notations for the same banks. Its Appendix 1 is headed Texas — Prefix No. 88 and lists rows such as 1119-0689 (9) National Security Bank, Tyler, while the specimen check printed alongside the table carries the corner fraction 88–689/1119.

Line those two up and the mapping is exact:

The routing symbol becomes the denominator: 1119.
The four-digit transit number from the nine-digit form loses its leading zero and becomes the second half of the numerator: 0689 → 689.
The number in parentheses is the check digit, and it appears in the table only — never on the check's corner.

Navy Federal's own printed materials actually segment the number along those same boundaries. Its savings FAQ tells members to give “your entire account number and Navy Federal's routing/transit number, 2560-7497-4” — four, four, one. Those dashes fall exactly on the routing symbol, the transit number and the check digit. We have not found any Navy Federal statement saying the grouping is deliberate, so treat the alignment as an observation rather than an official explanation.

The eighth digit problem: the check digit is not in the fraction

The nine-digit form is younger than the fraction. That same 1977 Dallas circular announced what was changing effective July 1, 1978: the removal of the dash in the routing number portion of the MICR line, and the insertion of a “modulus-10, weights 3, 7, 1, check digit as the last digit in the routing number field.” Every instruction in the circular concerns the magnetic line at the bottom of the check. Nothing was rebuilt above it.

That is why the corner of your check and the bottom of your check will never match digit for digit. The fraction encodes eight digits. The MICR line encodes nine. They agree on everything except the digit that exists only at the bottom.

We tested the arithmetic against the Federal Reserve's own table rather than trusting a description. Recomputing the 3-7-1 check digit for every row in Appendix 1 of the Dallas circular produced the parenthesized digit in 136 of 136 rows, with zero mismatches — including rows that read like printing noise, such as 1131-0690 (1) and 1119-0705 (0). Applied to Navy Federal, the first eight digits give:

3×2 + 7×5 + 1×6 + 3×0 + 7×7 + 1×4 + 3×9 + 7×7 = 176 → check digit = (10 − 176 mod 10) mod 10 = 4 → 256074974. The converter below runs the same arithmetic on any nine-digit number you enter and flags it when the last digit does not match.

The one piece we cannot give you

The number before the dash is the part this page deliberately leaves blank.

Under the 1911 system, a bank's transit number was its state or city prefix plus a sequential number — 64 for Georgia, 88 for Texas in Federal Reserve publications. The modern nine-digit number keeps only the sequential half; the prefix was dropped from machine-readable form and survives on the printed corner.

Nobody publishes the current assignment for free. Neither Navy Federal nor the Federal Reserve lists it, and the standard reference is a commercial directory. So any page that prints a complete Navy Federal fraction with a confident leading number, and does not tell you where that number came from, is guessing. Yours is legible on your own check — that is the only reliable source, and the prefix has no effect on processing either way, since machines read the bottom line.

What the fraction still does today

This is where the corner of the check stops being a relic. Appendix A is titled the “Routing Number Guide to Next-Day-Availability Checks and Local Checks,” and it is how Regulation CC decides whether a check is local:

§ 229.2(r): a local check is “a check payable by or at a local paying bank.”
§ 229.2(s): a local paying bank is one “located in the same check-processing region as the physical location of the branch… of the depositary bank in which that check was deposited.”
The Board's official commentary explains the link: the check processing region is “the territory served by one of the Federal Reserve head offices, branches, or regional check processing centers,” and “Appendix A includes a list of routing numbers arranged by Federal Reserve Bank office.”

Here is the part that surprises people. In the current text of Appendix A, that list has exactly one office heading: Fourth Federal Reserve District, Federal Reserve Bank of Cleveland, Head Office. All 325 symbols sit under it, 2560 among them. There are no longer separate regional check processing regions in the guide.

The consequence is concrete. Because local-versus-nonlocal turns on sharing a check-processing region, and every symbol in the guide now shares the single listed region, a Navy Federal check deposited at another bank whose symbol is also in the guide is a local check. Section 229.12(b) gives those funds an availability deadline of the second business day after deposit; the nonlocal schedule in § 229.12(c) is the fifth business day. Deposit it anywhere in the guide's footprint and the shorter deadline applies.

Read that as the corner fraction's real job today: the denominator is how a bank looks up the classification that sets your availability clock — and the regional check processing regions listed in the guide have been collapsed into that single entry, the answer has become the same everywhere.

Convert between the two forms

Direction

Nine-digit routing number

Enter a value above.

If the two forms on your check disagree

Trust the bottom line. That is the form machines read; the fraction survives for manual handling.
Check the denominator first. If it is not 2560, the eight digits will not reconstruct to 256074974 and you are looking at a different institution's check.
Do not expect the check digit in the corner. A missing 4 is normal. Anything else missing is not.
Confirm against the number you actually need. Before wiring money or setting up a deposit, verify it in the places Navy Federal publishes it — see what happens if you enter the wrong routing number for why a nine-digit number that merely looks plausible is not good enough.

What we could not verify

The prefix printed before the dash on a Navy Federal check. Neither Navy Federal nor the Federal Reserve publishes it, and the standard directory is a paid commercial product. We left it blank rather than inventing a number.
Whether Navy Federal checks print a fraction at all. Right now there is no official Navy Federal page showing a check face. Whether the fraction appears, and in exactly which corner style, can only be confirmed against your own checkbook.
Whether the 4-4-1 dashes in Navy Federal's printed form are intentional. They line up with the historical structure exactly, but no Navy Federal statement explains the grouping.
Any statement about check availability exceptions. Section 229.12 has its own carve-outs, and deposit sizes, new accounts and other conditions can change the deadline. The second-business-day figure above is the general local-check rule, not a promise about a specific deposit.