As rumors circle that delivery startups might consider merging to bulk up against larger competitors like Amazon or Uber, the smaller companies also pressing on with expanding on their own. In the latest development, today Postmates said that it would add another 100 cities to its coverage of the US, bringing the total number of towns covered by its restaurant and shop delivery app to 385 cities across the US and Mexico. Postmates operates in a lot of high-density urban areas, and the expanded service will add coverage for 50 million more people, working out to nearly 50 percent of all US households.