Previous reviews give a good overview. One added note is that there is a large gazebo at lots 1&2 that houses at least 100 bird nests under its roof. If you park near it, you will find that the birds enjoy target practice on your vehicle. The road noise is considerable at all hours. We camped here in a Motorhome.
We stayed here to visit Yosemite which was about 50 miles away. We found it to be a decent fairground park. The lower RV area [1&2] has Wi-Fi and sites are on grass, the upper area  has sewer and are on gravel, all the rest have only water and electric 30 amp. All require a lot of leveling. Only a couple of sites have shade which are in area 4 which has grass and asphalt. Self check in, no OTA TV or cable. Areas 1 & 2 are close to the highway, the rest are quiet and the town center is a couple of miles away. All in all it served the purpose but seemed a little overpriced for what you get. We camped here in a Fifth Wheel.
Considering that you get nothing but hookups, $15 would be a reasonable price to stay here. It is the only park in town. Many sites in lot 3 are very short. Big rigs will have better space in 1 or 2 (the lawn). We parked in 4 because of an event taking place on the lawn. The sites in lot 4 are small and difficult to park a 38' RV. The whole fairground is on about a 2% grade, so it requires significant leveling. The park host is friendly but incredibly persistent with his interference and criticism. He insisted we park in a space far too narrow until we refused to. Then he tried to micro-manage every step of our set-up despite clear requests to stop. Just be prepared. On our next Yosemite visit, we will not stay here. We camped here in a Fifth Wheel.
This place has a real mixed bag of sites depending on which area you choose. The best is the grass field, but it is right next to the highway. Be prepared to do some leveling. The highway quiets down quite a bit at night. The unexpected bonus was the free, and fast, WiFi. There is a somewhat over friendly host who tried to insist that we take an unwanted spot. He wanted to give parking directions until told the he could direct all he wanted, the only person I take directions from is the DW since she and I are liable for any mistakes. Given the size of our rig and the difficulty in finding spots in non-reservable CGs in the area, we would return again. We camped here in a Fifth Wheel.
Good inexpensive place to base from, to tour Yosemite if you don't want to drive on steep mountain roads. It is 36 miles from Arch Rock entrance. The RV Area 1&2 is in a wide open nice grassy field. It has water and electric only, and road noise, but we didn't have a problem sleeping. We tried parking in RV Area 3, but it was too much of a leveling problem. Area 5 has full hookups but is basically on a dirt driveway. The dump station is at the far end of RV Area 5. No office: just grab an envelope and write a check. (There are no space numbers, so grab any envelope. The envelopes have numbers on them so they can figure out who paid for which RV. There is a 'receipt' inside the envelope to put on your vehicle). Plan on at least a 40 minute drive to the entrance of the park and lots of driving once inside. It is beautiful though: well worth it. It would be nice to camp inside the park since it is a lot of driving to and from each am/pm. We camped here in a Fifth Wheel.
Lot 5 has back-in sites with attendant. Sites are very tight. When we put our 4-slides out it eliminated use of sites on both sides. There is NO broadband service in the area. You can snag a Wi-Fi in town 2 miles away. Had to use many boards to level coach. There are other areas as another has noted but these areas are likely going to be used for groups. If in the area we would use the park. It is a good location to visit Yosemite Park. Don't recommend using Hwy. 49 coming in from the north with a large RV - hills, winding with tight curves. We camped here in a Motorhome.
We had stayed at a fairground in Indiana, which was a good experience. So we thought we'd try another one. Big mistake! I don't think the people who run this place really want RV campers. Here is our story. The good: in this area, $25 is a really cheap rate. The park offers reasonable access to Yosemite, and the town of Mariposa is cute and interesting. The bad: We were there Sunday p.m. through Friday a.m. The grime and dirt in the men's bathroom sink and showers that was there on Sunday was still here Friday a.m. when we left. These facilities were not touched during our 5 day stay. Disgusting! Then there is the issue of what campsites are really available. There are 5 camping areas. When we arrived, all but #4 were open. #s 1,2, and 3, are grass sites with a few trees. #5 is a dirt parking lot, with an ugly fence as a backdrop. We settled in #3, on the lawn, under a tree. The weekend attendant came to collect our fee and said nothing about the appropriateness of our site selection. He was very nice; we talked about what to see in Yosemite. On Monday, a sign appeared on the check-in bulletin board saying lot #3 was Closed (even though we had just checked in the day before). On Tuesday, a second sign appeared saying NO CAMPING ON THE GRASS. This was posted even though at least 3/4 of their sites are grassy; and in their description in Travel Life, they present themselves as "mostly grassy sites." We stayed put, and on Thursday a.m. the manager came by to ask: "When will you be leaving?" When I responded tomorrow morning, his response was, "Well, good!" Boy: didn't that make me feel welcome. What a credit he and this park are to Mariposa and California tourism! We would never stay here again. And then there is the issue of power outages and surges that we experienced here: but I won't go into that. In my opinion, this is a place to avoid. We camped here in a Fifth Wheel.
Pretty spot in an open field on the Fairgrounds; about 30 miles to Yosemite. No frills, but picnic tables close to the sites. Individual campers use the self-registration procedure for payment of camping fees and check in. You stop at entrance to the Fairgrounds and complete a registration card, deposit it with payment into a drop box, and pick your site in the field. Just outside the quaint town of Mariposa. We camped here in a Motorhome.