The reasons why Americans are interested in Seoul and regard Seoul as more important than other regions are as follows. One is that Westerners had to enter Joseon during the opening of the port and enter Seoul, where the foreign legation was located, and even if they traveled to the provinces, they had to go through Seoul to the provinces. In addition, Seoul is characterized by a common area visited by Americans. In this article, I would like to analyze the perceptions of Seoul that appeared in the interview period through the interview period of Americans and further summarize the perceptions of Seoul by country. I would like to analyze the records left by visiting Korea from the 1880s to the 1910s. Representatively, we will focus on the records of 10 people, including Lowell, Gilmore, Daniel Gifford, Mrs. Underwood, Hulbert, Allen, Underwood, J Robert Moose, Sands, and Noble. The analysis focused on the first impression of Seoul recognized by Americans and the day and night scenery of Seoul. The first impression showed common interest in the notation of Seoul on the map, Namsan Mountain and Buksan Mountain, two large mountains surrounding the royal palace, and the walls and gates between these two mountains, the royal palace, roads, relics, and the population of Seoul. The only change here was about the road. The daytime part of Seoul showed common interest in transportation, shops and merchants, education, modern schools, sewage treatment and hygiene related to infectious diseases. Here, the change was pointed out as a change in transportation means, such as tram, train, and steamboat, and as a change in schools, modern school education and methods were mentioned in the traditional Seodang. The night part of Seoul showed common interest in Bonghwa, Bosingakjong, curfew, and patrol systems, which correspond to communication. Here, the change was due to the change in communication, and the whole body and telegram were heard instead of beacon, and the curfew was abolished. These changes were mainly changes that appeared after the Gabo Reform, and changes by period could be examined. In addition, most Americans emphasized that the pace of modernization and development of Joseon is faster than that of other capitals. The attempt is late, but it indicates that the speed is fast. Finally, I finish writing in anticipation of being able to summarize differences or changes in perceptions by country by analyzing perceptions of Seoul by country other than the United States.