Our Favorites section allows you to save individual properties that you have found on Trulia and want to easily view again later. It sounds as though you may have saved a search or have created an email alert for a particular city. You can edit your saved searches and email alerts at the links below and should be able to remove a city that you're no longer interested in.
Please check out the links below and let us know if you need any further assistance:
Ali, Community Manager