Full episodes of "Gunsmoke" are available for free on the Full Episodes page of TVLand.com, as of June 2015. The website offers a small selection of episodes that varies from week to week.
To watch it, place the cursor over Full Episodes, then click on See all Full Episodes on the drop-down menu that appears. Click the link titled "Gunsmoke" under the Full Episodes By Show heading.
"Gunsmoke" aired 635 episodes during its television run from 1955 to 1975. TVLand and Encore Westerns air the series in syndication.
The series had multiple format changes. It began as a half hour, black and white show. It then became an hour long, and later it aired in color. The one hour color episodes are syndicated most frequently.