Napa County Maidenhead Grid Areas

More than 45 grid areas are fully or partially included in Napa County. All of the designations begin with CM88, and end in two lower-case letters. At our latitude, the individual areas are approximately 4.5 miles wide and 2.9 miles high (and 5.4 miles along a diagonal). A few “squares” touching the county are not shown, but can be visualized easily by extending the ones nearby.

You can get your latitude and longitude from Google Maps: just select your point on the map, right-click, and choose “What’s Here?”. Then, use this link to get your grid area:

(Map created using’s GridMapper)

Distances between grid references can be calculated from:

All these grid references begin with CM88, and end in the 2 lower-case letters shown.