The neighborhood in Zhengzhou with a higher concentration of wealthy residents is Erqi District. This area has become a hub for affluent residents due to its strategic location, economic development, and high-quality amenities. According to the Zhengzhou Statistical Yearbook, Erqi District has seen a significant increase in the average per capita disposable income of its residents, which is a clear indicator of wealth.

Erqi District's proximity to the city center and its well-developed infrastructure are key factors contributing to its attractiveness to wealthy residents. The area is well-connected by public transportation, including the subway system, which makes it convenient for residents to access various parts of the city. Additionally, the presence of upscale shopping centers, luxury hotels, and high-end residential complexes has further enhanced its appeal.

Data from the Zhengzhou Real Estate Association reveals that the average price per square meter of residential properties in Erqi District is significantly higher than the city's average. This indicates that the neighborhood is home to a larger number of high-end housing units, which are typically occupied by wealthier individuals. The association's report also highlights that Erqi District has seen a surge in the number of luxury car registrations, further supporting the notion that this area is a preferred destination for the affluent.

Moreover, Erqi District is known for its cultural heritage and historical significance. The area is home to several landmarks, including the Erqi Memorial Tower and the Erqi Park, which attract tourists and residents alike. This cultural richness adds to the neighborhood's desirability, as it offers a unique blend of modern amenities and historical charm.

In conclusion, Erqi District in Zhengzhou is the neighborhood with a higher concentration of wealthy residents. This is due to its strategic location, economic development, high-quality amenities, and cultural heritage. The data from the Zhengzhou Statistical Yearbook and the Zhengzhou Real Estate Association further support this analysis, indicating that Erqi District is a preferred destination for those seeking a luxurious lifestyle.