405 Area Code Becoming Exhausted

[David]

The overlay plan does sound like the best approach, or at least the approach with the least amount of disruption for current numbers. The article didn't exactly say this, but I assume the new 539 code is also using a similar overlay?

[OKCDrummer77]

The overlay plan does sound like the best approach, or at least the approach with the least amount of disruption for current numbers. The article didn't exactly say this, but I assume the new 539 code is also using a similar overlay?

Yes. 539 covers the same area that 918 covers, so 10-digit dialing is mandatory in that area.

Many years ago, I found a website that listed all possible area codes with their status. That site had 539, 572, and 578 as "reserved for future use in Oklahoma". Since 539 obviously worked out, it would appear that either 572 or 578 will be the overlay code for 405.