If you are trying to research a Campground cottage...

1.  Find your Lot Number
From 1867 through 1875, each Campground cottage or tent was identified by a unique lot number.  The use of street numbers began in 1876.  Once you know your lot number, you can use that to find the owner(s) of your cottage during the 1867-75 time period.

Use this map to look up your lot number: [link to re-drawn 1873 Pease-Mullin map]
 
2. Consult the Edgartown tax assessments
Before 1880, Oak Bluffs was part of Edgartown.  The Campground tax assessments for 1872 and 1875 have been digitized and are available here: ---

​Again, once you know your lot number, you can look up the owner of your cottage (or tent) in these years, and also find its assessed value.