Abstract: The Public Service department is the nerve of service delivery to the public and due to the high demand and expectations from the public, staff needs to work over and beyond the normal routine, be able to multitask and get out of the confront zone for them to delivery. This has created a stressful environment as most staff are not used to the new system which has a lot of uncertainties and pressures. The purpose of this study was to research the impact of stress on the performance of employees of the County Government of Kilifi. The main objective was to determine workplace stress and its effects on performance. To establish the effects of Job demand of the job, salary, job security and time pressure on employees performance. The research design was a descriptive survey design and the target population research was the 2300 employees of Public Service department in the seven sub counties of the County Government of Kilifi. The study shows that Job demand was a stress fact that hindered employee’s performance though the stress levels were manageable thus did not affect their performance. A strong positive correlation existed between performance and Job demand. Time pressure was a major stressor as most employees felt due to working for long hours was a major challenge in that dual responsibility of dividing their time as working long hours denies them time with their family and this posed as a big challenge. A strong positive correlation existed between time pressure for the job and performance was noted. Employee felt that to some extent Salary was inadequate but it was not a stressor which hinders their performance. Majority of employee considers their job secure and do not find job security stressful. They also noted that Job Security influence their commitment to their employer. It is therefore concluded that workplace stress affects the performance of Kilifi County employees especially time pressure.