Maine Coon Color Codes Explained: EMS, CFA & What The Codes Mean
If you’ve ever looked at a Maine Coon pedigree, breeder page, or registration document, you may have noticed cryptic combinations such as “MCO a 22”, “ns 11”, or “d 09 24”. To new owners, these codes look like random letters and numbers, but to breeders, they provide an exact genetic description of your cat’s coat colour, pattern, and even white spotting.
Colour codes enable Maine Coon breeders to communicate precisely, avoid confusion, and correctly register cats with organisations such as TICA or FIFe.
This article breaks down exactly how the system works, what each letter and number means, and how you can decode your own cat’s colour, even if you’ve never read a pedigree before.
Quick Answer
Maine Coon color codes are shorthand systems used by cat registries and breeders to describe a cat’s breed, colour, pattern, and white spotting. In EMS-style coding, MCO means Maine Coon, while letters and numbers that follow identify things like black, blue, red, cream, silver, tortie, tabby pattern, and white markings. Different registries use different systems, so the exact code format depends on whether you are looking at FIFe/EMS, GCCF/GEMS, CFA, or another registration system. FIFe’s EMS system, for example, uses MCO for Maine Coon and codes such as n for black, a for blue, d for red, e for cream, f for black tortie, s for silver, and w for white.
What The Colour Codes Represent
Every Maine Coon colour code is built from three components:
- Base Colour Letter
- Modifiers (if present): Such as silver (s) or white (w)
- Pattern Number: Tabby type, shaded, smoke, etc.
Once you understand these elements, any combination becomes easy to read.
Maine Coon Colour Codes Explained
Below is a table summarising the most common codes used across major registries (FIFe, WCF, TICA, GCCF).
Base Colour Codes (Letter Only)
| Letter | Colour Name | Description |
|---|---|---|
| n | Black | Solid black; also base for brown tabby |
| a | Blue | Dilute black; grey with a soft, silver tone |
| d | Red | Orange/ginger; intense warm tone |
| e | Cream | Dilute red; pale apricot tone |
| f | Black Tortie | Black + red patches (female cats) |
| g | Blue-Cream Tortie | Dilute tortie (blue + cream) |
| w | White | White cat with any eye colour (coded separately as w 61/62/63) |
| o | Not used in Maine Coons | (Chocolate/lilac not accepted in breed standard) |
Colour Modifiers (Add-On Letters)
These letters modify the base colour.
| Modifier | Meaning | Effect |
|---|---|---|
| s | Silver | Removes pigment at fur base → silver tabby or smoke |
| y | Golden | Warm apricot undercoat (rare) |
| 02 / 03 / 09 | White spotting | Determines amount/location of white patches |
Pattern Codes (Numbers)
| Code | Pattern Name | Description |
|---|---|---|
| 21 | Agouti (tabby unspecified) | Used when the tabby type isn’t identified |
| 22 | Classic/Blotched Tabby | Swirl pattern, bullseye mark on sides |
| 23 | Mackerel Tabby | Narrow vertical stripes |
| 24 | Spotted Tabby | Round or oval spots; broken s tripes |
| 25 | Ticked Tabby | No side stripes; bands of colour on each hair |
| 11 | Shaded | Light undercoat, dark tips |
| 12 | Shell | Very light-tipped coat (Chinchilla-like) |
| — | Solid | Very light-tipped coat (Chinchilla-like) |
Examples Of Real Maine Coon Colour Codes (Decoded)
Example 1: MCO ns 22
- n = black
- s = silver
- 22 = classic tabby
Black Silver Classic Tabby Maine Coon
This will resemble a light silver cat with dark, black tabby swirls.
Example 2: MCO a 23
- a = blue
- 23 = mackerel tabby
Blue Mackerel Tabby Maine Coon
Narrow grey-blue stripes with a cool metallic tone.
Example 3: MCO d 09 24
- d = red
- 09 = low-white spotting
- 24 = spotted tabby
Red Spotted Tabby with White
A red-gold tabby with small spots and limited white on paws and chest.
Example 4: MCO ns
- n = black
- s = silver
- No number = solid pattern
Black Smoke Maine Coon
Black outer coat with a dramatic white/silver undercoat visible when the fur parts.
Why Understanding Colour Codes Matters
Knowing your Maine Coon’s coat code gives you far more information than simply calling your cat “tabby” or “blue.”
✅ It makes buying from breeders safer
You’ll know exactly what colour you’re paying for, and whether the breeder is accurately representing the kitten.
✅ You can understand coat changes over time
Smoke, silver, and shaded cats change dramatically from kittenhood to adulthood. Codes help you anticipate this.
✅ It clarifies show eligibility
Some colours (e.g., chocolate, lilac, colourpoint) are NOT permitted in Maine Coons under major registries.
Colour codes prevent confusion.
✅ It connects you to your cat’s genetics
You can see dilution, silver, and tortie inheritance at a glance.
Tips For Decoding A Colour Code At Home
If you have your cat’s pedigree or microchip registration, you can use this process:
- Identify the first letter → base colour
- Look for any modifier letters → silver, golden, tortie
- Check for numbers → tabby type or shaded/smoke
- If there’s a “0X” number → this indicates white spotting
- Put it together → you now know the exact coat description
Final Thoughts
The Maine Coon colour-code system may seem complicated at first glance, but once you understand the structure – base colour → modifiers → pattern—the entire system becomes surprisingly logical. These codes allow breeders and owners to communicate with precision, ensuring that each cat’s coat colour is correctly understood and recorded.
Whether your Maine Coon is a striking black smoke, a warm red classic tabby, or a rare blue-silver shaded, you now have the tools to decode exactly what those letters and numbers mean.
FAQ
What does MCO mean in Maine Coon color codes?
MCO is the breed code for Maine Coon in EMS-style coding systems. It appears at the start of the code before the colour and pattern details.
What are Maine Coon color codes used for?
They are used to describe a Maine Coon’s breed, base colour, pattern, and white spotting in a standardised way. Breeders, registries, pedigree databases, and cat shows use them so cats can be identified accurately.
What does the letter n mean in Maine Coon color codes?
In EMS-style colour coding, n means black. FIFe notes that n comes from the French word noir.
What does a mean in Maine Coon color codes?
a means blue, which in cat-colour terms is the diluted version of black.
What does d mean in Maine Coon color codes?
d means red in EMS colour coding.
What does e mean in Maine Coon color codes?
e means cream, which is the diluted version of red.
What does s mean in Maine Coon color codes?
s means silver in EMS-style coding. This code is used when the coat has the silver inhibitor gene affecting pigment distribution.
What does w mean in Maine Coon color codes?
w means white.
What does f mean in Maine Coon color codes?
f means black tortie in EMS coding.
What do the numbers mean in Maine Coon color codes?
In EMS-style systems, the numbers usually describe things such as white spotting or tabby pattern. For example, numbers like 01, 02, and 03 refer to levels of white spotting, while pattern numbers such as 22 can refer to classic tabby. GCCF’s colour gallery gives MCO as 03 22 as an example of a blue silver classic tabby and white Maine Coon.
Are Maine Coon color codes the same in every registry?
No. Different registries use different coding systems. FIFe uses EMS-style coding, GCCF uses GEMS-related coding, and CFA also has its own colour and class references, so the same cat may be described slightly differently depending on the registry.
Does CFA use the same Maine Coon color codes as EMS?
No, not exactly. CFA publishes Maine Coon colour classes and breed standards, but its registration and class references are not identical to FIFe’s EMS letter-number format.
Can Maine Coon color codes tell you the pattern as well as the color?
Yes. In coding systems like EMS, the code can describe the base colour, silver or smoke effect, white spotting, and tabby pattern, not just the main colour.
What does MCO as 03 22 mean?
Using GCCF’s example, MCO means Maine Coon, a means blue, s means silver, 03 means bicolour with white, and 22 means classic tabby. Together, that describes a blue silver classic tabby and white Maine Coon.
Why do Maine Coon breeders use color codes instead of plain language?
Because codes are shorter, more precise, and standardised. They make it easier to record pedigrees, registrations, breeding outcomes, and show entries without ambiguity.
