You should list these activities on your CV, and perhaps briefly in your other materials.
But where these activities should be thoroughly described is in your recommendation letters. Hiring departments will not just want to see that you've been on a lot of committees: it's easy to be on a lot of commmittees without accomplishing much. (Alas, this is all too visible in my own department.) Instead, hiring departments will want to hear about the impact that your service has had on the department and on the people around you, and your recommenders are the most natural people to say this.
(Indeed, I remember last year we had one applicant who was finishing her Ph.D. at a non-elite program. Her research wasn't strong enough to get a tenure-track job at a research-oriented university (at least not without a postdoc first), but I vividly remember one of the letters which went on and on about all of the ways in which she'd made a hugely positive impact on her department as a grad student. It was quite moving really. Anyway, she got hired at an elite liberal-arts school.)
Anyway, if you are proud of your service record, make sure that it is addressed by a couple of your letter writers. (You don't need to have your service addressed by all of your writers -- indeed, it is good to have a balance of internal letters and letters from people outside your own department, and the latter will probably mostly talk about your research.)