Many factors can affect value. The following are some of those factors. As a rule the more of these important qualities possessed by the map the greater its value.

1. Region Depicted. There are more collectors of maps of some regions than others, affecting the size of the market and thus the value of maps of those areas. For instance, world maps have a universal appeal. Among nations there are sizable numbers of collectors for maps of the United States, Great Britain, Germany, Australia and Canada and increasingly Japan and China. Within the United States some of the larger states such as Texas, California and Florida have a lot of interest but the earliest maps of any state or region would be in demand. Some areas that have small populations but that are vacation destinations such as Bermuda, Malta and some of the islands of the West Indies are popular. Areas that are more remote or with smaller less affluent populations have less demand and are often very decorative and well priced.

2. Historical importance. Some maps, particularly those of explorers, are the earliest to depict an area or feature. Other maps might depict an important battle or similar event. Other examples may be imagined geography such as California as an island. Generally the closer such maps date to the event the more importance and thus value they have.

3. Size. Generally the larger the map the more opportunity for detail and decoration. Such maps also display well so they are usually more valuable than smaller maps of the same area or event. Some maps are very large and difficult to display, reducing their value.

4. Rarity. Some maps were issued in small numbers and are relatively rare. If other conditions that enhance value, are present the map is further enhanced by rarity, but rarity alone does not create value.

5. Age. For similar maps the older is generally the most valuable but age alone does not determine value as some very early maps of regions of relatively little interest have relatively little value. Age, like rarity, is more an enhancement of value.

6. Aesthetic qualities. Some early maps were enhanced with large cartouches, sea monsters , ships and other decorative additions. Such maps display well and thus have greater value. Colour and condition also affect value.