Hee Hee Illahee Resort, 4751 Astoria St NE, Salem, OR 97305 877.564.7295
Distance from rally: 2.8 miles NE
https://heeheeillahee.com
According to the front desk, they have 36 daily and weekly sites, and 102 month-to-month sites.   Rates in October, 2017 were $47+tax daily, $235 per week.

Phoenix RV Park   4130 Silverton Rd NE, Salem, OR,  97305,  503-581-2497
https://phoenixrvpark.com
Distance from rally: 2.0 miles
According to the front desk, Phoenix holds 25 sites for overnighters. Max stay is 21 days. Rates in October, 2017 were: Daily: $47.50, Weekly: $250.

Salem Campground and RV’s,  3700 Hagers Grove Road SE,  Salem, OR 97301 503.581.6736
http://www.salemrv.com
Distance from rally: 5 .1 miles

Silver Spur RV Park  12622 SIlverton Rd NE,  Silverton, OR 97381 503-873-2020
http://www.silverspurrvpark.com
Distance from rally: 11.4 miles
Rate in October, 2017 was $42.00 Daily, $275.00 weekly

For WBAC members who are also Elks, there are two lodges close to the fairgrounds:

In Salem, there is a lodge at 2336 Turner Rd SE, Salem, OR 97302-2060.  They have 36 sites, most with 50 amp electric, water and sewer, and an on the grounds dump station. This Elks lodge is 4.3 miles South of the Fairgrounds.

The Keizer Elks Lodge is 2.4 miles North of the Fairgrounds and has 41 full hookup sites. There are also four water and electric sites and a dump station.

Both of these Elks Lodges, as well as the other lodges offering RV sites can be viewed at:
https://www.elks.org/lodges/LocalFacilities.cfm?stateCode=OR