The energetic Victor Wamsley, Edward's youngest son, was the last male representative of the family name in Ourimbah in the 1920s. Vic Wamsley had been involved in the timber trade and had an orchard and produce business. By far the greatest involvement in orchards was by the Bailey family. No less than eight Baileys, from Kangy Angy and Palmdale down to Ourimbah were orchardists during the ’twenties. Their main concentration of activity was at the southern end of Manning's grant, around the area of Bailey's Road and Cut Rock Road. The equally large Robson family and the even larger Morris family were involved in a wider range of employment activities and many moved on to other areas. Other notable families in Ourimbah in the 1920s were those of Foott, Sharpe, Sohier, Vincent and Yarnall. The Sohier name has been preserved by the naming of the redeveloped sports fields after a family member. Once the scene of occasional shows at which trotting horse races were a feature, the facilities at Sohier Park have been much improved, an indication of the local esteem for sporting activity.

In the years from the 1930s depression, the local agricultural industries of citrus and dairy farming went into gradual decline. As early as the 1950s it was realised that the dairy industry could not survive. The citrus farmers found themselves in a similar bind, unable to match the economies of scale available to producers elsewhere.

The early 1970s land boom, which saw much land redeveloped into smaller holdings, was the end of any serious potential for farming as a means of supporting a family in Ourimbah. Land use once again changed, with pockets of urban development amongst the acreages, themselves now valuable for the leisure and past-time opportunities they offer rather than as agricultural holdings.