Yes Amber, I agree! it seems as if they have a monopoly on a bunch of listings. However, there are three directory aggregating sites that I would highly recommend getting your site listed on: **Acxicom, Infogroup, and Localez. **These three sites aggregate many of the sites from that annoying Yext index (Find the site on Yext, try to fix it ,end back on Yext.. . O.o).
Your title says "Local Coordinator" if the intension is to rank locally, look for local citations from local sites for local you can use whitesparc.ca, and for some national getlisted.org and Google ("Keyword" + Directory or "Keyword" + "Location" Directory). Lastly, how many, and our company feel about Yext <--- Overpriced! IMO spammy, they took over my Email, once you sign up you will get an email from every directory on the Yext SERP. Now we create a directories email account for each client.
Keep in mind all your information must be accurate, we like to use the exact NAP (Name Address and Phone#) that is in the places account for each of the directories. We also make sure to fill out each listing as much as possible, and we only submit to relevant categories.
Lastly,
When submitting to directories you should use some caution, some of the sites can be of low quality or have unnatural profiles. In this case it's better to not be listed. Using open site explorer can help you determine anchor texts and low quality links of the sites you are planning on submitting to.
Hope this helps and if you have any more questions about local search, I would be glad to help.