Each U.S. Navy Carrier Air Wing has an Electronic Attack Squadron (VAQ) assigned with 5 EA-18G Growlers. (There has been talk of increasing the number of aircraft.)
In addition, there are five "expeditionary" VAQs that operate ashore and support USAF or Allied operations. The Navy has proposed disestablishing these squadrons, only to face pushback from joint commanders and Congress.
Now remember the rule is that you can only have colorful markings on two aircraft per squadron. When you have a larger squadron of 12 F/A-18s, that's one-sixth of the unit with color. But the VAQs are small squadrons, so they get 40% color birds.
Here's an older photo (2021) of a VAQ-138 "Yellowjackets" EA-18G at Nellis Air Force Base in Nevada. Nice livery.