Carefree Corner

There were four postcards issued by Carefree Corner and were available from 1956 until 1974.

Casa de Fritos

Casa de Fritos issued one postcard and was available in 1955.

Kaiser Aluminum

Kaiser Aluminum issued one postcard and was available from 1955 through 1960. This was a Mirro-Krome postcard produced by H. S. Crocker Co., Inc. of San Francisco, California.

The Monsanto Hall of Chemistry

The Monsanto Hall of Chemistry issued four postcards from 1955 through 1966.

Monsanto

Monsanto issued two postcards for the Home of the Future and was available from 1957 through 1968.

Monsanto's Adventure thru Inner Space

Monsanto's Adventure thru Inner Space issued two booklets. The first booklet was an artist's rendition of the Adventure thru Inner Space attraction. The front and back of these booklets were removable postcards. The second booklet had actual pictures of the attraction. Only the front of the booklet was a removable postcard.

TWA

TWA issued one postcard of the Rocket to the Moon and was available from 1955 through 1962.

The Upjohn Company

The Upjohn Company issued 12 postcards between 1955 and 1970.

The Wurlitzer Company

The Wurlitzer Company issued two postcards.

Global Van Lines

Global Van Lines issued one postcard.

The Silver Banjo Barbeque

The Silver Banjo Barbeque issued one postcard and was available from 1957 through 1961.

The Flower Mart

Disneyland issued one "postcard" of the Flower Mart which was an order form that let you send artificial flowers to your friends.

Disneyland Records

I'm not sure if Disneyland Records actually gave this card out as a Participant or if it was used as a promotional ad as there is no informtion, as of yet, about the card.

Disneyland Records is the original name of the Walt Disney Company's record company. After long associations with primarily RCA Victor Records, with a few select titles on Capitol, Disneyland Records was established by the Disney studio in 1956 with its first release entitled A Child's Garden of Verses. Most of its output is mainly children's music and recordings, mostly based on (or around) Disney cartoons, though the label has also produced several recordings that do not involve any Disney characters, such as the "Children's Favorites" series. The company changed its name to Walt Disney Records in 1989.

(source : http://en.wikipedia.org/wiki/Disneyland_Records)

June 28, 1957 was the first Date Nite at Disneyland when the park became the number one venue for fun after the sun went down, and Carnation Plaza Gardens was the place to be!

A milestone for the Elliott Brothers was the release of the "Date Night At Disneyland" record album in 1958, a live recording of some of the bands most popular dance tunes. The Elliott Brothers were also an important part of Disneyland's Big Band Festivals which began in 1961.

For at least twelve years Lloyd and Bill and their band made a wonderful contribution to Disneyland's rich musical heritage.

(source : http://davelandweb.com/centralplaza/plazagardens.html)